12-letter words starting with I
Embark on a linguistic journey with words that begin with the letter I. This section showcases how I at the start shapes the identity and sound of various words. From commonly used terms to rare finds, explore the diverse range of words that start with I, enriching your vocabulary and appreciation for language.
| Word | Points | Definition | Sentence example |
|---|---|---|---|
| intelligence | 15 | secret information about an enemy (or potential enemy) | we sent out planes to gather intelligence on their radar coverage |
| instructions | 14 | a manual usually accompanying a technical device and explaining how to install or operate it | - |
| independence | 18 | freedom from control or influence of another or others | - |
| instrumental | 14 | serving or acting as a means or aid | instrumental in solving the crime |
| intellectual | 14 | of or associated with or requiring the use of the mind | intellectual problems |
| introduction | 15 | formally making a person known to another or to the public | - |
| investigator | 16 | a police officer who investigates crimes | - |
| increasingly | 18 | advancing in amount or intensity | she became increasingly depressed |
| intervention | 15 | the act or fact of interposing one thing between or among others | - |
| interference | 17 | the act of hindering or obstructing or impeding | - |
| investigated | 17 | - | - |
| indistinctly | 18 | in a dim indistinct manner | - |
| imprisonment | 18 | the state of being imprisoned | the imprisonment of captured soldiers |
| irresistible | 14 | impossible to resist; overpowering | irresistible (or resistless) impulses |
| incidentally | 18 | of a minor or subordinate nature | these magnificent achievements were only incidentally influenced by Oriental models |
| intersection | 14 | the set of elements common to two or more sets | the set of red hats is the intersection of the set of hats and the set of red things |
| inconvenient | 17 | not conveniently timed | an early departure is inconvenient for us |
| intoxication | 21 | the physiological state produced by a poison or other toxic substance | - |
| indefinitely | 19 | to an indefinite extent; for an indefinite time | this could go on indefinitely |
| intimidating | 16 | discouraging through fear | - |
| illegitimate | 15 | contrary to or forbidden by law | an illegitimate seizure of power |
| interrogated | 14 | - | - |
| interruption | 14 | an act of delaying or interrupting the continuity | - |
| incorporated | 17 | formed or united into a whole | - |
| installation | 12 | the act of installing something (as equipment) | the telephone installation took only a few minutes |
| intoxicating | 22 | extremely exciting as if by alcohol or a narcotic | - |
| incompetence | 20 | lack of physical or intellectual ability or qualifications | - |
| inauguration | 13 | the act of starting a new operation or practice | he opposed the inauguration of fluoridation |
| indifference | 21 | the trait of lacking enthusiasm for or interest in things generally | - |
| individually | 20 | apart from others | taken individually, the rooms were, in fact, square |
| insufficient | 20 | of a quantity not able to fulfill a need or requirement | insufficient funds |
| irreversible | 17 | incapable of being reversed | irreversible momentum toward revolution |
| impenetrable | 18 | permitting little if any light to pass through because of denseness of matter | impenetrable gloom |
| incarcerated | 17 | - | - |
| inexplicable | 25 | incapable of being explained or accounted for | inexplicable errors |
| invisibility | 20 | the quality of not being perceivable by the eye | - |
| inflammation | 19 | the state of being emotionally aroused and worked up | he tried to calm those who were in a state of extreme inflammation |
| inconsistent | 14 | not in agreement | - |
| incorrigible | 17 | difficult or impossible to manage or control | an incorrigible mess |
| intimidation | 15 | the act of intimidating a weaker person to make them do something | - |
| illumination | 14 | the luminous flux incident on a unit area | - |
| insurrection | 14 | organized opposition to authority; a conflict in which one faction tries to wrest control from another | - |
| illustration | 12 | showing by example | - |
| infiltration | 15 | the slow passage of a liquid through a filtering medium | the infiltration of seawater through the lava |
| intermission | 14 | a time interval during which there is a temporary cessation of something | - |
| inaccessible | 18 | capable of being reached only with great difficulty or not at all | - |
| interpreting | 15 | an explanation of something that is not immediately obvious | he annoyed us with his interpreting of parables |
| interstellar | 12 | between or among stars | the density of hydrogen in interplanetary and interstellar space |
| intermediate | 15 | around the middle of a scale of evaluation | intermediate capacity |
| incompatible | 20 | used especially of drugs or muscles that counteract or neutralize each other's effect | - |
| incomparable | 20 | such that comparison is impossible; unsuitable for comparison or lacking features that can be compared | an incomparable week of rest and pleasure |
| imperfection | 21 | the state or an instance of being imperfect | - |
| insufferable | 20 | too extreme to bear | the insufferable heat of August in a New York apartment with no air conditioning |
| invulnerable | 17 | immune to attack; impregnable | gunners raked the beach from invulnerable positions on the cliffs |
| impoverished | 23 | poor enough to need help from others | - |
| intermediary | 18 | a negotiator who acts as a link between parties | - |
| inflammatory | 22 | arousing to action or rebellion | - |
| insemination | 14 | the act of sowing (of seeds in the ground or, figuratively, of germs in the body or ideas in the mind, etc.) | - |
| intermittent | 14 | stopping and starting at irregular intervals | intermittent rain showers |
| interception | 16 | (American football) the act of catching a football by a player on the opposing team | - |
| illuminating | 15 | tending to increase knowledge or dissipate ignorance | an illuminating lecture |
| indiscretion | 15 | a petty misdeed | - |
| impersonator | 16 | someone who (fraudulently) assumes the appearance of another | - |
| inconclusive | 19 | not conclusive; not putting an end to doubt or question | an inconclusive reply |
| inauspicious | 16 | not auspicious; boding ill | - |
| inhospitable | 19 | not hospitable | they are extremely inhospitable these days |
| inadmissible | 17 | not deserving to be admitted | inadmissible evidence |
| infringement | 18 | a crime less serious than a felony | - |
| infiltrating | 16 | - | - |
| inexplicably | 28 | in a manner differing from the usual or expected | - |
| inconsolable | 16 | sad beyond comforting; incapable of being consoled | inconsolable when her son died |
| interminable | 16 | tiresomely long; seemingly without end | an interminable sermon |
| incalculable | 18 | too much to be measured | incalculable riches |
| incontinence | 16 | indiscipline with regard to sensuous pleasures | - |
| identifiable | 18 | capable of being identified | - |
| inexperience | 23 | lack of experience and the knowledge and understanding derived from experience | procedural inexperience created difficulties |
| introductory | 18 | serving as a base or starting point | an introductory art course |
| interrogator | 13 | a questioner who is excessively harsh | - |
| invigorating | 17 | imparting strength and vitality | the invigorating mountain air |
| incoherently | 20 | in an incoherent manner | he talked incoherently when he drank too much |
| incandescent | 17 | emitting light as a result of being heated | an incandescent bulb |
| immeasurable | 18 | impossible to measure | immeasurable suffering |
| indisputable | 17 | impossible to doubt or dispute | indisputable (or sure) proof |
| impersonated | 17 | - | - |
| impertinence | 18 | inappropriate playfulness | - |
| impermanence | 20 | the property of not existing for indefinitely long durations | - |
| inextricably | 26 | in an inextricable manner | motives inspired by Mammon were often inextricably blended with things pertaining to Caesar and to God |
| indefensible | 18 | (of theories etc) incapable of being defended or justified | - |
| intracranial | 14 | within the skull | - |
| interlocking | 19 | the act of interlocking or meshing | an interlocking of arms by the police held the crowd in check |
| incineration | 14 | the act of burning something completely; reducing it to ashes | - |
| incapacitate | 18 | make unable to perform a certain action | - |
| immortalized | 26 | - | - |
| inefficiency | 25 | unskillfulness resulting from a lack of efficiency | - |
| inarticulate | 14 | without or deprived of the use of speech or words | inarticulate beasts |
| impartiality | 19 | an inclination to weigh both views or opinions equally | - |
| intercession | 14 | the act of intervening (as to mediate a dispute, etc.) | - |
| incriminated | 17 | - | - |
| irrespective | 19 | in spite of everything; without regard to drawbacks | - |
| illustrating | 13 | - | - |
| internalized | 22 | - | - |
| invitational | 15 | pertaining to or characteristic of an invitation | - |
| immeasurably | 21 | without bounds | - |
| interpretive | 17 | that provides interpretation | - |
| intelligible | 15 | capable of being apprehended or understood | - |
| impressively | 22 | in an impressive manner | the students progressed impressively fast |
| immunization | 25 | the act of making immune (especially by inoculation) | - |
| indigestible | 16 | digested with difficulty | - |
| irritability | 17 | excessive sensitivity of an organ or body part | - |
| isolationist | 12 | of or relating to isolationism | - |
| irrationally | 15 | in an irrational manner | they acted irrationally |
| impregnation | 17 | creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | - |
| implantation | 16 | (embryology) the organic process whereby a fertilized egg becomes implanted in the lining of the uterus of placental mammals | - |
| infrequently | 27 | not many times | in your 1850 church you not infrequently find a dramatic contrast between the sumptuous appointments of the building itself and the inhuman barrack-like living conditions in the church room |
| indebtedness | 16 | a personal relation in which one is indebted for a service or favor | - |
| irredeemable | 17 | insusceptible of reform | irredeemable sinners |
| irregularity | 16 | an irregular asymmetry in shape; an irregular spatial pattern | - |
| inaugurating | 14 | - | - |
| indiscipline | 17 | the trait of lacking discipline | - |
| indisputably | 20 | - | - |
| intensifying | 19 | increasing in strength or intensity | - |
| invertebrate | 17 | lacking a backbone or spinal column | worms are an example of invertebrate animals |
| irresistibly | 17 | incapable of being resisted | - |
| incinerating | 15 | - | - |
| illustrative | 15 | serving to demonstrate | - |
| immortalised | 17 | - | - |
| inspectorate | 16 | a body of inspectors | - |
| intertwining | 16 | - | - |
| interjection | 21 | the action of interjecting or interposing an action or remark that interrupts | - |
| interdiction | 15 | a court order prohibiting a party from doing a certain activity | - |
| irregardless | 14 | regardless; a combination of irrespective and regardless sometimes used humorously | - |
| incomparably | 23 | in an incomparable manner or to an incomparable degree | she is incomparably gifted |
| immaculately | 21 | in an immaculate manner | gone was the casually dressed Canadian she had thought a backwoodsman--this man was immaculately tailored |
| inflationary | 18 | associated with or tending to cause increases in inflation | inflationary prices |
| interrelated | 13 | reciprocally connected | - |
| interspecies | 16 | arising or occurring between species | - |
| interlocutor | 14 | the performer in the middle of a minstrel line who engages the others in talk | - |
| irreversibly | 20 | in an irreversible manner | this old tradition is irreversibly disappearing |
| isolationism | 14 | a policy of nonparticipation in international economic and political relations | - |
| incendiaries | 15 | - | - |
| illegitimacy | 20 | the status of being born to parents who were not married | - |
| intersecting | 15 | crossed or intersected in the form of an X | - |
| intersession | 12 | - | - |
| intransigent | 13 | impervious to pleas, persuasion, requests, reason | an intransigent conservative opposed to every liberal tendency |
| intransitive | 15 | a verb (or verb construction) that does not take an object | - |
| interspersed | 15 | - | - |
| intelligibly | 18 | in an intelligible manner | the foreigner spoke to us quite intelligibly |
| intermarried | 15 | - | - |
| interglacial | 15 | - | - |
| incautiously | 17 | without caution or prudence | - |
| incapability | 21 | the quality of not being capable -- physically or intellectually or legally | - |
| idiosyncrasy | 21 | a behavioral attribute that is distinctive and peculiar to an individual | - |
| immutability | 21 | the quality of being incapable of mutation | - |
| immunologist | 17 | a medical scientist who specializes in immunology | - |
| infotainment | 17 | a film or TV program presenting the facts about a person or event | - |
| inseminating | 15 | - | - |
| inordinately | 16 | extremely | she was inordinately smart |
| inconsolably | 19 | - | - |
| ineradicable | 17 | not able to be destroyed or rooted out | ineradicable superstitions |
| independency | 21 | freedom from control or influence of another or others | - |
| indoctrinate | 15 | teach doctrines to; teach uncritically | The Moonies indoctrinate their disciples |
| indissoluble | 15 | (of a substance) incapable of being dissolved | - |
| intriguingly | 17 | - | - |
| insufferably | 23 | to an insufferable degree | it was insufferably hot in the room |
| interconnect | 16 | cause to be interconnected or interwoven | - |
| introversion | 15 | the folding in of an outer layer so as to form a pocket in the surface | - |
| inactivation | 17 | breaking up a military unit (by transfers or discharges) | - |
| idealization | 22 | (psychiatry) a defense mechanism that splits something you are ambivalent about into two representations--one good and one bad | - |
| iconoclastic | 18 | characterized by attack on established beliefs or institutions | - |
| imperishable | 21 | lasting a long time | imperishable truths |
| ingratiating | 14 | calculated to please or gain favor | a smooth ingratiating manner |
| ingratiation | 13 | the act of gaining acceptance or affection for yourself by persuasive and subtle blandishments | - |
| inextricable | 23 | not permitting extrication; incapable of being disentangled or untied | an inextricable knot |
| infiniteness | 15 | the quality of being infinite; without bound or limit | - |
| indefensibly | 21 | - | - |
| incompletely | 21 | not to a full degree or extent | words incompletely understood |
| individuated | 18 | - | - |
| interminably | 19 | all the time; seemingly without stopping | a theological student with whom I argued interminably |
| interstitial | 12 | of or relating to interstices | - |
| interweaving | 19 | - | - |
| inventorying | 19 | making an itemized list of merchandise or supplies on hand | - |
| invalidating | 17 | establishing as invalid or untrue | - |
| irritatingly | 16 | in an irritating manner | - |
| irredeemably | 20 | - | - |
| irrelevantly | 18 | in an irrelevant manner | suddenly and irrelevantly, she asked him for money |
| irremediable | 17 | impossible to remedy or correct or redress | an irremediable error |
| ichnographic | 25 | - | - |
| ichnological | 20 | - | - |
| ichthyocolla | 25 | - | - |
| ichthyofauna | 26 | - | - |
| ichthyolatry | 26 | the worship of fish | - |
| ichthyolites | 23 | - | - |
| ichthyolitic | 25 | - | - |
| ichthyologic | 26 | - | - |
| ichnofossils | 20 | - | - |
| iatrochemist | 19 | - | - |
| iambographer | 22 | - | - |
| ichthyophagy | 32 | - | - |
| impregnators | 17 | - | - |
| improvements | 21 | - | - |
| improvidence | 22 | a lack of prudence and care by someone in the management of resources | - |
| improvisated | 20 | - | - |
| improvisates | 19 | - | - |
| improvisator | 19 | - | - |
| impudentness | 17 | - | - |
| impudicities | 19 | - | - |
| impugnations | 17 | - | - |
| impropriator | 18 | - | - |
| impropriates | 18 | - | - |
| impressional | 16 | - | - |
| impressments | 18 | - | - |
| imprisonable | 18 | - | - |
| improbations | 18 | - | - |
| improperness | 18 | an improper demeanor | - |
| impropriated | 19 | - | - |
| impuissances | 18 | - | - |
| impurenesses | 16 | - | - |
| imputability | 21 | - | - |
| inadaptation | 15 | - | - |
| inadequacies | 24 | - | - |
| inadequately | 25 | in an inadequate manner or to an inadequate degree | the temporary camps were inadequately equipped |
| inadmissibly | 20 | - | - |
| inadvertence | 18 | an unintentional omission resulting from failure to notice something | - |
| inadvertency | 21 | the trait of forgetting or ignoring your responsibilities | - |
| inanimations | 14 | - | - |
| inactivities | 17 | - | - |
| inactiveness | 17 | a disposition to remain inactive or inert | - |
| imputatively | 22 | - | - |
| inabstinence | 16 | - | - |
| inaccessibly | 21 | in an inaccessible manner | located inaccessibly on the top of a mountain |
| inaccuracies | 18 | - | - |
| inaccurately | 19 | in an inaccurate manner | this student works rather inaccurately and sloppily |
| inactivating | 18 | - | - |
| inapparently | 19 | - | - |
| impignorated | 18 | - | - |
| impignorates | 17 | - | - |
| impingements | 19 | - | - |
| impishnesses | 19 | - | - |
| implementers | 18 | - | - |
| implementing | 19 | - | - |
| implementors | 18 | - | - |
| impierceable | 20 | - | - |
| impetrations | 16 | - | - |
| impersonates | 16 | - | - |
| impertinency | 21 | - | - |
| imperviously | 22 | - | - |
| impeticossed | 19 | - | - |
| impeticosses | 18 | - | - |
| impetiginous | 17 | of or relating to or having impetigo | - |
| implications | 18 | - | - |
| implicatures | 18 | - | - |
| implicitness | 18 | inexplicitness as a consequence of being implied or indirect | - |
| impostumates | 18 | - | - |
| impotentness | 16 | - | - |
| impoundments | 19 | - | - |
| impoverisher | 22 | - | - |
| impoverishes | 22 | - | - |
| imprecations | 18 | - | - |
| imprecisions | 18 | - | - |
| impostumated | 19 | - | - |
| imposthumate | 21 | - | - |
| implorations | 16 | - | - |
| impoliteness | 16 | a discourteous manner that ignores accepted social usage | - |
| imponderable | 19 | a factor whose effects cannot be accurately assessed | human behavior depends on many imponderables |
| imponderably | 22 | - | - |
| importancies | 18 | - | - |
| importations | 16 | - | - |
| importunings | 17 | - | - |
| imposingness | 17 | - | - |
| impregnating | 18 | - | - |
| incensements | 16 | - | - |
| incinerators | 14 | - | - |
| incipiencies | 18 | - | - |
| incisiveness | 17 | keenness and forcefulness of thought or expression or intellect | - |
| incivilities | 17 | - | - |
| inclemencies | 18 | - | - |
| inchoatively | 23 | - | - |
| inchoateness | 17 | - | - |
| incentivised | 18 | - | - |
| incentivises | 17 | - | - |
| incentivized | 27 | - | - |
| incentivizes | 26 | - | - |
| incertitudes | 15 | - | - |
| incessancies | 16 | - | - |
| incestuously | 17 | by incest | incestuously conceived |
| incharitable | 19 | - | - |
| inclinations | 14 | - | - |
| inclinatoria | 14 | - | - |
| inclinometer | 16 | a measuring instrument for measuring the angle of magnetic dip (as from an airplane) | - |
| incommutable | 20 | not interchangeable or able to substitute one for another | a rare incommutable skill |
| incommutably | 23 | - | - |
| incompatibly | 23 | without compatibility | - |
| incompetency | 23 | lack of physical or intellectual ability or qualifications | - |
| incommodious | 19 | uncomfortably or inconveniently small | incommodious hotel accommodations |
| includedness | 16 | - | - |
| incoagulable | 17 | - | - |
| incogitative | 18 | - | - |
| incognisable | 17 | - | - |
| incognisance | 17 | - | - |
| incognizable | 26 | incapable of being perceived or known | - |
| incognizance | 26 | a lack of knowledge or recognition | - |
| incoherences | 19 | - | - |
| incompetents | 18 | - | - |
| incensations | 14 | - | - |
| inappeasable | 18 | - | - |
| inaugurators | 13 | - | - |
| inauguratory | 16 | - | - |
| incalculably | 21 | - | - |
| incalescence | 18 | the property of being warming | - |
| inaudibility | 18 | the quality of not being perceptible by the ear | - |
| inattentions | 12 | - | - |
| inappellable | 18 | - | - |
| inappetences | 18 | - | - |
| inapplicable | 20 | not capable of being applied | rules inapplicable to day students |
| inapplicably | 23 | - | - |
| inappositely | 19 | - | - |
| inarticulacy | 19 | - | - |
| inartificial | 17 | - | - |
| incandescing | 18 | - | - |
| incantations | 14 | - | - |
| incardinates | 15 | - | - |
| incarnadined | 16 | - | - |
| incarnadines | 15 | - | - |
| incarnations | 14 | - | - |
| incarvilleas | 17 | - | - |
| incatenation | 14 | - | - |
| incardinated | 16 | - | - |
| incarcerator | 16 | - | - |
| incapacitant | 18 | - | - |
| incapacities | 18 | - | - |
| incapsulated | 17 | - | - |
| incapsulates | 16 | - | - |
| incarcerates | 16 | - | - |
| incendiarism | 17 | malicious burning to destroy property | - |
| impersonally | 19 | without warmth | he treated his patients impersonally |
| ignorantness | 13 | ignorance (especially of orthodox beliefs) | - |
| illiberality | 17 | a disposition not to be liberal (generous) with money | - |
| illiberalize | 23 | - | - |
| illimitation | 14 | - | - |
| illiquations | 21 | - | - |
| illiteracies | 14 | - | - |
| illiterately | 15 | - | - |
| illogicality | 18 | invalid or incorrect reasoning | - |
| illuminances | 16 | - | - |
| illiberalism | 16 | - | - |
| illiberalise | 14 | - | - |
| illaqueating | 22 | - | - |
| illaqueation | 21 | - | - |
| illegalising | 14 | - | - |
| illegalities | 13 | - | - |
| illegalizing | 23 | - | - |
| illegibility | 18 | the quality of writing (print or handwriting) that cannot be deciphered | - |
| illuminative | 17 | - | - |
| illustratory | 15 | - | - |
| illuviations | 15 | - | - |
| imaginations | 15 | - | - |
| imbecilities | 18 | - | - |
| imbibitional | 18 | - | - |
| imbrications | 18 | - | - |
| imitableness | 16 | - | - |
| immaculacies | 20 | - | - |
| illustrators | 12 | - | - |
| illuminators | 14 | - | - |
| illusionisms | 14 | - | - |
| illusionists | 12 | - | - |
| illusiveness | 15 | - | - |
| illusoriness | 12 | - | - |
| illustrateds | 13 | - | - |
| ignobilities | 15 | - | - |
| ichthyopsids | 26 | - | - |
| iconomachist | 21 | - | - |
| iconometries | 16 | - | - |
| iconophilism | 21 | - | - |
| iconophilist | 19 | - | - |
| icosahedrons | 18 | - | - |
| idealisation | 13 | (psychiatry) a defense mechanism that splits something you are ambivalent about into two representations--one good and one bad | - |
| ideationally | 16 | - | - |
| iconomachies | 21 | - | - |
| iconologists | 15 | - | - |
| ichthyosauri | 23 | - | - |
| ichthyosaurs | 23 | - | - |
| iconographer | 20 | - | - |
| iconographic | 22 | - | - |
| iconolatries | 14 | - | - |
| iconolatrous | 14 | - | - |
| iconological | 17 | - | - |
| identifiably | 21 | in an identifiable manner | they were identifiably different |
| ideographies | 19 | - | - |
| idolatrising | 14 | - | - |
| idolatrizers | 22 | - | - |
| idolatrizing | 23 | - | - |
| idolatrously | 16 | in an idolatrous manner | the people idolatrously worshipped the Golden Calf |
| idolisations | 13 | - | - |
| idolizations | 22 | - | - |
| idoxuridines | 21 | - | - |
| ignitability | 18 | - | - |
| idolatrisers | 13 | - | - |
| idolatresses | 13 | - | - |
| ideologising | 15 | - | - |
| ideologizing | 24 | - | - |
| ideopraxists | 22 | - | - |
| idioglossias | 14 | - | - |
| idiomorphism | 22 | - | - |
| idiorhythmic | 26 | - | - |
| idiothermous | 18 | - | - |
| ignitibility | 18 | - | - |
| impanelments | 18 | - | - |
| impedimental | 19 | - | - |
| impendencies | 19 | - | - |
| impenetrably | 21 | - | - |
| impenetrated | 17 | - | - |
| impenetrates | 16 | - | - |
| impenitences | 18 | - | - |
| impenitently | 19 | in an impenitent manner | - |
| impeccancies | 22 | - | - |
| impeachments | 23 | - | - |
| impannelling | 17 | - | - |
| imparadising | 18 | - | - |
| imparkations | 20 | - | - |
| impartations | 16 | - | - |
| impassionate | 16 | - | - |
| impassioning | 17 | - | - |
| impastations | 16 | - | - |
| imperatively | 22 | in an imperative and commanding manner | - |
| imperatorial | 16 | - | - |
| imperception | 20 | - | - |
| imperialized | 26 | - | - |
| imperializes | 25 | - | - |
| imperialness | 16 | - | - |
| imperilments | 18 | - | - |
| imperishably | 24 | - | - |
| impermanency | 23 | the property of not existing for indefinitely long durations | - |
| imperialists | 16 | - | - |
| imperialisms | 18 | - | - |
| imperceptive | 23 | - | - |
| impercipient | 20 | - | - |
| imperfective | 24 | aspect without regard to the beginning or completion of the action of the verb | - |
| imperforable | 21 | - | - |
| imperforated | 20 | - | - |
| imperialised | 17 | - | - |
| imperialises | 16 | - | - |
| impersistent | 16 | - | - |
| immanentisms | 18 | - | - |
| immersionist | 16 | - | - |
| immethodical | 22 | - | - |
| immigrations | 17 | - | - |
| imminentness | 16 | the state of being imminent and liable to happen soon | - |
| immiseration | 16 | - | - |
| immiserising | 17 | - | - |
| immiserizing | 26 | - | - |
| immobilisers | 18 | - | - |
| immersionism | 18 | - | - |
| immensurable | 18 | impossible to measure | - |
| immanentists | 16 | - | - |
| immaterially | 19 | - | - |
| immatureness | 16 | not having reached maturity | - |
| immaturities | 16 | - | - |
| immediatisms | 19 | - | - |
| immemorially | 21 | - | - |
| immobilising | 19 | - | - |
| immobilities | 18 | - | - |
| immobilizers | 27 | - | - |
| immortalizes | 25 | - | - |
| immotilities | 16 | - | - |
| immovability | 24 | not capable of being moved or rearranged | - |
| immunisation | 16 | the act of making immune (especially by inoculation) | - |
| immunoassays | 19 | - | - |
| immunologies | 17 | - | - |
| immortalizer | 25 | - | - |
| immobilizing | 28 | the act of limiting movement or making incapable of movement | - |
| immoderacies | 19 | - | - |
| immoderately | 20 | to a degree that exceeds the bounds or reason or moderation | - |
| immoderation | 17 | the quality of being excessive and lacking in moderation | - |
| immoralities | 16 | - | - |
| immortaliser | 16 | - | - |
| immortalises | 16 | - | - |
| immunotoxins | 23 | - | - |
| infrequences | 26 | - | - |
| infundibular | 18 | - | - |
| infundibulum | 20 | any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
| infuriations | 15 | - | - |
| infusibility | 20 | - | - |
| infusionisms | 17 | - | - |
| infraorbital | 17 | - | - |
| inflationism | 17 | - | - |
| inflationist | 15 | - | - |
| inflectional | 17 | characterized by inflections indicating grammatical distinctions | inflectional morphology is used to indicate number and case and tense and person etc. |
| inflorescent | 17 | - | - |
| influentials | 15 | - | - |
| infomercials | 19 | - | - |
| informations | 17 | - | - |
| informidable | 20 | - | - |
| infusionists | 15 | - | - |
| ingatherings | 17 | - | - |
| ingeminating | 16 | - | - |
| ingravescent | 18 | - | - |
| ingurgitated | 15 | - | - |
| ingurgitates | 14 | - | - |
| inhabitances | 19 | - | - |
| inhabitation | 17 | the act of dwelling in or living permanently in a place (said of both animals and men) | he studied the creation and inhabitation and demise of the colony |
