12-letter words starting with U
Embark on a linguistic journey with words that begin with the letter U. This section showcases how U 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 U, enriching your vocabulary and appreciation for language.
| Word | Points | Definition | Sentence example |
|---|---|---|---|
| unbelievable | 19 | having a probability too low to inspire belief | - |
| unacceptable | 20 | not conforming to standard usage | the following use of `access' was judged unacceptable by a panel of linguists; `You can access your cash at any of 300 automatic tellers' |
| unemployment | 21 | the state of being unemployed or not having a job | unemployment is a serious social evil |
| unreasonable | 14 | beyond normal limits | unreasonable demands |
| unidentified | 17 | being or having an unknown or unnamed source | - |
| unexpectedly | 27 | without advance planning | - |
| unbelievably | 22 | not easy to believe | - |
| unimaginable | 17 | totally unlikely | - |
| unforgivable | 21 | not excusable | - |
| unsuccessful | 19 | failing to accomplish an intended result | - |
| unattractive | 17 | not appealing to the senses | - |
| unauthorized | 25 | without official authorization | an unauthorized strike |
| unofficially | 23 | without official authorization | - |
| undetectable | 17 | barely able to be perceived | - |
| unsuspecting | 17 | not suspicious | deceiving the unsuspecting public |
| unscrupulous | 16 | without scruples or principles | unscrupulous politicos who would be happy to sell...their country in order to gain power |
| unparalleled | 15 | radically distinctive and without equal | unparalleled athletic ability |
| untranslated | 13 | - | - |
| unmistakable | 20 | clearly revealed to the mind or the senses or judgment | - |
| unattainable | 14 | impossible to achieve | an unattainable goal |
| uncontrolled | 15 | not being under control; out of control | the greatest uncontrolled health problem is AIDS |
| undiscovered | 19 | not yet discovered | undiscovered islands |
| unresponsive | 17 | aloof or indifferent | was unresponsive to her passionate advances |
| unfathomable | 22 | resembling an abyss in depth; so deep as to be unmeasurable | - |
| unsupervised | 18 | not supervised or under constant observation | the school maintains unsupervised study halls during free periods |
| unauthorised | 16 | without official authorization | - |
| undocumented | 18 | lacking necessary documents (as for e.g. permission to live or work in a country) | undocumented aliens |
| understaffed | 20 | inadequate in number of workers or assistants etc. | overcrowded and understaffed hospitals |
| unchallenged | 19 | generally agreed upon; not subject to dispute | - |
| unregistered | 14 | (a boat or vessel) not furnished with official documents | - |
| unrestricted | 15 | not restricted or exclusive | - |
| unsatisfying | 19 | not up to expectations | - |
| unmanageable | 17 | difficult to use or handle or manage because of size or weight or shape | - |
| unilaterally | 15 | in a unilateral manner; by means of one part or party | they worked out an agreement unilaterally |
| unremarkable | 20 | found in the ordinary course of events | - |
| undercurrent | 15 | a current below the surface of a fluid | - |
| underclothes | 18 | undergarment worn next to the skin and under the outer garments | - |
| unrestrained | 13 | marked by uncontrolled excitement or emotion | - |
| unemployable | 21 | not acceptable for employment as a worker | his illiteracy made him unemployable |
| unscientific | 19 | not consistent with the methods or principles of science | an unscientific lack of objectivity |
| unpardonable | 17 | not admitting of pardon | unpardonable behavior |
| underdressed | 15 | inadequately or too informally clothed | - |
| unimaginably | 20 | to an unimaginable extent | - |
| uninterested | 13 | having no care or interest in knowing | she appeared totally uninterested |
| undetermined | 16 | not brought to a conclusion; subject to further thought | our lawsuit is still undetermined |
| unprofitable | 19 | producing little or no profit or gain | deposits abandoned by mining companies as unprofitable |
| unrecognized | 25 | not having a secure reputation | short stories by unrecognized writers |
| unencumbered | 19 | free of encumbrance | inherited an unencumbered estate |
| unchangeable | 20 | not changeable or subject to change | a fixed and unchangeable part of the germ plasm |
| unflattering | 16 | showing or representing unfavorably | an unflattering portrait |
| unreasonably | 17 | to a degree that exceeds the bounds or reason or moderation | his prices are unreasonably high |
| undercutting | 16 | - | - |
| unaccustomed | 19 | unusual or unfamiliar | an unaccustomed pleasure |
| unimpressive | 19 | not capable of impressing | - |
| undergarment | 16 | a garment worn under other garments | - |
| undersheriff | 22 | - | - |
| unstructured | 15 | lacking the system or structure characteristic of living bodies | - |
| unprincipled | 19 | having little or no integrity | - |
| unmistakably | 23 | in a signal manner | - |
| unproductive | 20 | not producing desired results | the talks between labor and management were unproductive |
| unquestioned | 22 | generally agreed upon; not subject to dispute | - |
| unreservedly | 19 | - | - |
| unquenchable | 28 | impossible to quench | unquenchable thirst |
| unassailable | 14 | without flaws or loopholes | - |
| uncultivated | 18 | characteristic of a person who is not cultivated or does not have intellectual tastes | - |
| unconvincing | 20 | not convincing | as unconvincing as a forced smile |
| unfavourable | 20 | involving or creating circumstances detrimental to success or effectiveness | - |
| unappetizing | 26 | not appetizing in appearance, aroma, or taste | - |
| ungovernable | 18 | incapable of being controlled | - |
| unpleasantly | 17 | in an unpleasant manner | he had been unpleasantly surprised |
| unobstructed | 17 | free from impediment or obstruction or hindrance | an unobstructed view |
| unanswerable | 17 | impossible to answer | an unanswerable argument |
| unapologetic | 17 | unwilling to make or express an apology | an unapologetic believer |
| unclassified | 18 | not arranged in any specific grouping | - |
| universality | 18 | the quality of being universal; existing everywhere | - |
| underpinning | 16 | - | - |
| undiminished | 19 | not lessened or diminished | - |
| unacquainted | 24 | not knowledgeable about something specified | a person unacquainted with our customs |
| unaffiliated | 19 | not affiliated | - |
| undemocratic | 19 | not in agreement with or according to democratic doctrine or practice or ideals | the union broke with its past undemocratic procedures |
| undercoating | 16 | - | - |
| underwritten | 16 | - | - |
| unsanctioned | 15 | without explicit official permission | unsanctioned use of company cars |
| unseasonably | 17 | not in accordance with the season | it was unseasonably cold |
| unworthiness | 18 | the quality of being not particularly suitable or befitting | his praise released from her loud protestations of her unworthiness |
| unthoughtful | 22 | not exhibiting or characterized by careful thought | - |
| unprejudiced | 25 | free from undue bias or preconceived opinions | an unprejudiced appraisal of the pros and cons |
| unobtainable | 16 | not capable of being obtained | timber is virtually unobtainable in the islands |
| unnoticeable | 16 | not drawing attention | an unnoticeable cigarette burn on the carpet |
| unrepeatable | 16 | not able or fit to be repeated or quoted | - |
| undefeatable | 18 | - | - |
| unchaperoned | 20 | - | - |
| unfertilized | 25 | not having been fertilized | an unfertilized egg |
| universalist | 15 | of or relating to or tending toward universalism | - |
| undependable | 18 | not worthy of reliance or trust | an undependable assistant |
| undisputable | 17 | not open to question; obviously true | - |
| underselling | 14 | - | - |
| understating | 14 | - | - |
| unsterilized | 22 | not sterilized | - |
| unthinkingly | 23 | in a thoughtless manner | - |
| unforgivably | 24 | in an unpardonable manner or to an unpardonable degree | - |
| unbreachable | 21 | - | - |
| unbreathable | 19 | - | - |
| unacceptably | 23 | to an unacceptable degree | The percentage of lead in our drinking water is unacceptably high |
| unachievable | 22 | impossible to achieve | - |
| unconstraint | 14 | the trait of lacking restraint or control; reckless freedom from inhibition or worry | - |
| uncharitable | 19 | lacking love and generosity | all pious words and uncharitable deeds |
| uncirculated | 17 | - | - |
| unchivalrous | 20 | offensively discourteous | - |
| uneventfully | 21 | in an uneventful manner | the space shuttle landed uneventfully |
| uneconomical | 18 | wasteful of resources | - |
| unlawfulness | 18 | the quality of failing to conform to law | - |
| unlikelihood | 20 | the improbability of a specified outcome | - |
| underpowered | 19 | - | - |
| underwriting | 17 | - | - |
| understudied | 15 | - | - |
| understudies | 14 | - | - |
| unsanctified | 18 | not holy because unconsecrated or impure or defiled | - |
| urbanisation | 14 | the social process whereby cities grow and societies become more urban | - |
| urbanization | 23 | the social process whereby cities grow and societies become more urban | - |
| unprevailing | 18 | - | - |
| unpopularity | 19 | the quality of lacking general approval or acceptance | - |
| unmercifully | 22 | without pity; in a merciless manner | - |
| unsupportive | 19 | not furnishing support or assistance | - |
| unfulfilling | 19 | - | - |
| unappetising | 17 | not appetizing in appearance, aroma, or taste | - |
| unassailably | 17 | in an unalterable and unchangeable manner | - |
| unassignable | 15 | incapable of being transferred | - |
| unassistedly | 16 | - | - |
| unassociated | 15 | - | - |
| unassumingly | 18 | in an unassuming manner | she is unassumingly skeptical of her own work |
| unattainably | 17 | in an unattainable manner or to an unattainable degree | this house is unattainably expensive |
| unaspiringly | 18 | - | - |
| unascendible | 17 | - | - |
| unapplausive | 19 | - | - |
| unapplicable | 20 | - | - |
| unapproached | 22 | - | - |
| unarticulate | 14 | without or deprived of the use of speech or words | - |
| unartificial | 17 | - | - |
| unartistlike | 16 | - | - |
| unascendable | 17 | - | - |
| unattenuated | 13 | - | - |
| unattributed | 15 | - | - |
| unbeneficial | 19 | - | - |
| unbespeaking | 21 | - | - |
| unbetterable | 16 | - | - |
| unbiasedness | 15 | - | - |
| unblindfolds | 19 | - | - |
| unblinkingly | 22 | showing no emotion | the convicted killer listened unblinkingly to the reading of his sentence |
| unblushingly | 21 | without blushing | his principal opponent unblushingly declared victory before the ballots had been counted |
| unauspicious | 16 | - | - |
| unavailingly | 19 | - | - |
| unbarricaded | 18 | - | - |
| unbarricades | 17 | - | - |
| unbecomingly | 22 | without decorousness | - |
| unbefriended | 19 | - | - |
| unappeasably | 21 | - | - |
| ultrarealism | 14 | - | - |
| umbrageously | 20 | - | - |
| unacceptance | 20 | - | - |
| unacclimated | 19 | - | - |
| unaccredited | 18 | lacking official approval | - |
| umbilication | 18 | - | - |
| ultroneously | 15 | - | - |
| ultrarealist | 12 | - | - |
| ultrarefined | 16 | - | - |
| ultrasensual | 12 | - | - |
| ultraserious | 12 | - | - |
| ultravacuums | 19 | - | - |
| ultraviolent | 15 | - | - |
| ultraviolets | 15 | - | - |
| ultraviruses | 15 | - | - |
| unadmonished | 19 | - | - |
| unadulterate | 13 | - | - |
| unanalytical | 17 | - | - |
| unanalyzable | 26 | representing the furthest possible extent of analysis or division into parts | this weight of evidence is something mystical and unanalyzable |
| unanswerably | 20 | - | - |
| unapparelled | 17 | - | - |
| unappealable | 18 | not subject to appeal | the judge's ruling was handed down in a preliminary hearing rather than a trial and was therefore unappealable |
| unappealably | 21 | - | - |
| unanalysable | 17 | - | - |
| unamiability | 19 | - | - |
| unadventrous | 16 | - | - |
| unadvertised | 17 | - | - |
| unaffectedly | 24 | - | - |
| unaffordable | 21 | - | - |
| unaggressive | 17 | not aggressive; not given to fighting or assertiveness | - |
| unalleviated | 16 | - | - |
| unambivalent | 19 | - | - |
| unappeasable | 18 | not to be placated or appeased or moved by entreaty | - |
| uncompelling | 19 | - | - |
| unconfounded | 19 | - | - |
| unconfusedly | 21 | - | - |
| uncongealing | 16 | - | - |
| unconjugated | 23 | - | - |
| unconsecrate | 16 | - | - |
| unconsenting | 15 | - | - |
| unconsidered | 16 | without proper consideration or reflection | unconsidered words |
| unconformity | 22 | - | - |
| unconforming | 20 | - | - |
| uncomplacent | 20 | - | - |
| uncomposable | 20 | - | - |
| uncompounded | 20 | not constituting a compound | - |
| unconcealing | 17 | - | - |
| unconcerning | 17 | - | - |
| unconclusive | 19 | - | - |
| unconfinable | 19 | - | - |
| unconfinedly | 21 | - | - |
| uncontracted | 17 | - | - |
| unconversant | 17 | - | - |
| uncultivable | 19 | not suitable for cultivation or tilling | thickets of indigenous trees...on uncultivable land |
| uncurtaining | 15 | - | - |
| undeceivable | 20 | - | - |
| undecillions | 15 | - | - |
| undeciphered | 21 | not deciphered | Linear A is still undeciphered |
| undecomposed | 20 | not decayed | - |
| undefoliated | 17 | - | - |
| unctuousness | 14 | smug self-serving earnestness | - |
| unctuosities | 14 | - | - |
| uncoquettish | 26 | - | - |
| uncorrelated | 15 | not varying together | - |
| uncounselled | 15 | - | - |
| uncourageous | 15 | - | - |
| uncovenanted | 18 | - | - |
| uncreditable | 17 | - | - |
| uncritically | 19 | in an uncritical manner | he accepted her decisions uncritically |
| undelectable | 17 | - | - |
| uncommonness | 18 | extraordinariness as a consequence of being marked by an uncommon or superlative quality | - |
| unbridgeable | 18 | not bridgeable | a wide unbridgeable river |
| uncelebrated | 17 | - | - |
| uncensorious | 14 | - | - |
| unchangeably | 23 | in an unalterable and unchangeable manner | his views were unchangeably fixed |
| unchangingly | 22 | - | - |
| uncatalogued | 16 | - | - |
| uncapturable | 18 | - | - |
| unbrokenness | 18 | - | - |
| unburthening | 18 | - | - |
| uncalculated | 17 | - | - |
| uncalibrated | 17 | - | - |
| uncandidness | 16 | - | - |
| uncanonising | 15 | - | - |
| uncanonizing | 24 | - | - |
| uncapsizable | 27 | - | - |
| uncharitably | 22 | - | - |
| uncharnelled | 18 | - | - |
| unchasteness | 17 | - | - |
| uncleanliest | 14 | - | - |
| uncloistered | 15 | - | - |
| uncluttering | 15 | - | - |
| uncoalescing | 17 | - | - |
| uncoercively | 22 | - | - |
| uncomeatable | 18 | - | - |
| uncomeliness | 16 | - | - |
| uncivilities | 17 | - | - |
| unchastities | 17 | - | - |
| uncheerfully | 23 | - | - |
| unchristened | 18 | - | - |
| unchristians | 17 | - | - |
| unchronicled | 20 | - | - |
| uncinariases | 14 | - | - |
| uncinariasis | 14 | - | - |
| uncommercial | 20 | not conducive to commercial success | might prove arty and hence uncommercial |
| ultraradical | 15 | - | - |
| ultrafilters | 15 | - | - |
| ultraheating | 16 | - | - |
| ultraleftism | 17 | - | - |
| ultraleftist | 15 | - | - |
| ultraliberal | 14 | - | - |
| ultramarines | 14 | - | - |
| ultramontane | 14 | on or relating to or characteristic of the region or peoples beyond the Alps from Italy (or north of the Alps) | - |
| ultramundane | 15 | - | - |
| ultradistant | 13 | - | - |
| ultracompact | 20 | - | - |
| ubiquitarian | 23 | - | - |
| ubiquitously | 26 | - | - |
| uglification | 18 | - | - |
| ugsomenesses | 15 | - | - |
| ulcerousness | 14 | - | - |
| ultimateness | 14 | the state or degree of being ultimate; the final or most extreme in degree or size or time or distance | - |
| ultracareful | 17 | - | - |
| ultraprecise | 16 | - | - |
| unforeboding | 19 | - | - |
| unfranchised | 21 | - | - |
| unfraughting | 20 | - | - |
| unfrequented | 25 | devoid of creatures | a trail leading to an unfrequented lake |
| unfrequently | 27 | - | - |
| unfriendlier | 16 | - | - |
| unfriendlily | 19 | - | - |
| unfriendship | 21 | - | - |
| unfrightened | 20 | not affected by fright | - |
| unfossilized | 25 | - | - |
| unfossilised | 16 | - | - |
| unforeseeing | 16 | - | - |
| unforewarned | 19 | - | - |
| unformalised | 18 | - | - |
| unformalized | 27 | - | - |
| unformidable | 20 | - | - |
| unformulated | 18 | - | - |
| unfortunates | 15 | - | - |
| unfruitfully | 21 | - | - |
| unfurnishing | 19 | - | - |
| ungainliness | 13 | the carriage of someone whose movements and posture are extremely ungainly and inelegant | - |
| ungraciously | 18 | without grace; rigidly | - |
| ungratefully | 19 | in an ungrateful manner | - |
| ungroundedly | 18 | - | - |
| ungrudgingly | 19 | in a generous and ungrudging manner | he ungrudgingly agreed to pay for everybody's dinner when the guests found themselves without cash |
| unguentaries | 13 | - | - |
| unguentarium | 15 | - | - |
| unguiculated | 16 | having or resembling claws or nails | - |
| unguiculates | 15 | - | - |
| ungracefully | 21 | without grace; rigidly | - |
| ungovernably | 21 | - | - |
| ungenerosity | 16 | - | - |
| ungenerously | 16 | - | - |
| ungentleness | 13 | - | - |
| ungentrified | 17 | - | - |
| ungerminated | 16 | - | - |
| unglamorised | 16 | - | - |
| unglamorized | 25 | - | - |
| unhabituated | 18 | - | - |
| unearthliest | 15 | - | - |
| unenthralled | 16 | - | - |
| unerringness | 13 | - | - |
| unessentials | 12 | - | - |
| unevennesses | 15 | - | - |
| unexpressive | 24 | deliberately impassive in manner | - |
| unexpugnable | 24 | - | - |
| unendingness | 14 | - | - |
| unendangered | 15 | - | - |
| uneasinesses | 12 | - | - |
| unecological | 17 | - | - |
| unelaborated | 15 | giving only major points; lacking completeness | - |
| unembittered | 17 | - | - |
| unexpurgated | 23 | not having material deleted | volumes of the best plays, unexpurgated |
| unextenuated | 20 | - | - |
| unfadingness | 17 | - | - |
| unfeudalised | 17 | - | - |
| unfeudalises | 16 | - | - |
| unfeudalized | 26 | - | - |
| unfeudalizes | 25 | - | - |
| unfilterable | 17 | - | - |
| unfinishings | 19 | - | - |
| unfittedness | 16 | - | - |
| unflaggingly | 21 | - | - |
| unfertilised | 16 | not having been fertilized | - |
| unfairnesses | 15 | - | - |
| unfaithfully | 24 | in an unfaithful undependable unreliable manner | - |
| unfamiliarly | 20 | - | - |
| unfastidious | 16 | marked by an absence of due or proper care or attention to detail; not concerned with cleanliness | unfastidious in her dress |
| unfathomably | 25 | - | - |
| unfavourably | 23 | showing disapproval; in a disparaging way | - |
| unflamboyant | 22 | - | - |
| unionisation | 12 | act of forming labor unions | - |
| univalencies | 17 | - | - |
| universalise | 15 | make universal | - |
| universalism | 17 | the theological doctrine that all people will eventually be saved | - |
| universalize | 24 | make universal | This author's stories universalize old themes |
| universities | 15 | - | - |
| unjustnesses | 19 | - | - |
| unitizations | 21 | - | - |
| unitisations | 12 | - | - |
| unionization | 21 | act of forming labor unions | the issue underlying the strike was unionization |
| uniquenesses | 21 | - | - |
| unironically | 17 | - | - |
| unirradiated | 14 | - | - |
| uniseriately | 15 | - | - |
| unisexuality | 22 | - | - |
| unitarianism | 14 | a non-doctrinal religion that stresses individual freedom of belief and rejects the Trinity | - |
| unitednesses | 13 | - | - |
| unkennelling | 17 | - | - |
| unkindliness | 17 | - | - |
| unkindnesses | 17 | - | - |
| unmaintained | 15 | - | - |
| unmanageably | 20 | so as to be unmanageable | `This house is unmanageably large,' she complained |
| unmanneredly | 18 | - | - |
| unmarketable | 20 | not fit for sale | - |
| unmeasurable | 16 | impossible to measure | unmeasurable reaches of outer space |
| unmeasurably | 19 | - | - |
| unmeasuredly | 18 | - | - |
| unlovingness | 16 | - | - |
| unloveliness | 15 | - | - |
| unlibidinous | 15 | - | - |
| unlikeliness | 16 | the improbability of a specified outcome | - |
| unlikenesses | 16 | - | - |
| unliquidated | 23 | - | - |
| unlistenable | 14 | - | - |
| unliveliness | 15 | - | - |
| unmechanical | 21 | (of a person) lacking mechanical skills | - |
| unintroduced | 16 | - | - |
| unhandsomely | 21 | - | - |
| unhumanising | 18 | - | - |
| unhumanizing | 27 | - | - |
| unhydrolysed | 23 | - | - |
| unhydrolyzed | 32 | - | - |
| unhyphenated | 24 | - | - |
| unhysterical | 20 | - | - |
| unicamerally | 19 | - | - |
| unidealistic | 15 | - | - |
| unhospitable | 19 | - | - |
| unholinesses | 15 | - | - |
| unharbouring | 18 | - | - |
| unharmonious | 17 | not in harmony | - |
| unharnessing | 16 | - | - |
| unhealthiest | 18 | - | - |
| unheroically | 20 | - | - |
| unhesitating | 16 | characterized by quickness and firmness | his reply was unhesitating |
| unhingements | 18 | - | - |
| unhistorical | 17 | - | - |
| unifications | 17 | - | - |
| unifoliolate | 15 | - | - |
| unimprisoned | 17 | free from confinement or physical restraint | - |
| unimpugnable | 19 | - | - |
| unincumbered | 19 | - | - |
| uninfluenced | 18 | not influenced or affected | - |
| uninoculated | 15 | - | - |
| uninstalling | 13 | - | - |
| uninstructed | 15 | lacking information or instruction | - |
| unintegrated | 14 | separated or isolated from others or a main group | - |
| unimportuned | 17 | - | - |
| uniformities | 17 | - | - |
| unigenitures | 13 | - | - |
| unillusioned | 13 | - | - |
| unimolecular | 16 | - | - |
| unimportance | 18 | the state of being humble and unimportant | - |
| unduplicated | 18 | - | - |
| underexposes | 22 | - | - |
| underheating | 17 | - | - |
| underinsured | 14 | - | - |
| underkeepers | 19 | - | - |
| underkeeping | 20 | - | - |
| underkingdom | 21 | - | - |
| underlapping | 18 | - | - |
| underlayment | 18 | a pad placed under a carpet | - |
| underleasing | 14 | - | - |
| undergrowths | 20 | - | - |
| undergrounds | 15 | - | - |
| underfeeding | 18 | - | - |
| underfishing | 20 | - | - |
| underfonging | 18 | - | - |
| underfooting | 17 | - | - |
| underfulfils | 19 | - | - |
| underfunding | 18 | - | - |
| undergirding | 16 | - | - |
| underletters | 13 | - | - |
| underletting | 14 | - | - |
| underloading | 15 | - | - |
| underpeopled | 18 | - | - |
| underperform | 20 | perform less well or with less success than expected | My stocks underperformed last year |
| underplanted | 16 | - | - |
| underplaying | 19 | - | - |
| underpraised | 16 | - | - |
| underpraises | 15 | - | - |
| underpeeping | 18 | - | - |
| underpayment | 20 | a payment smaller than needed or expected | - |
| underlookers | 17 | - | - |
| underlyingly | 20 | - | - |
| undermanning | 16 | - | - |
| undermeaning | 16 | - | - |
| underminding | 17 | - | - |
| underminings | 16 | - | - |
| undernourish | 16 | provide with insufficient quality or quantity of nourishment | The stunted growth of these children shows that they are undernourished |
| underpassion | 15 | - | - |
| underpricing | 18 | - | - |
| underexposed | 23 | - | - |
| undeliberate | 15 | - | - |
| underblanket | 19 | - | - |
| underbreaths | 18 | - | - |
| underbridges | 17 | - | - |
| underbrushed | 19 | - | - |
| underbrushes | 18 | - | - |
| underbudding | 18 | - | - |
| underbudgets | 17 | - | - |
| underbuilder | 16 | - | - |
| underbidding | 18 | - | - |
| underbidders | 17 | - | - |
| undelightful | 20 | - | - |
| underachieve | 21 | perform less well or with less success than expected | John consistently underachieves, although he is very able |
| underactions | 15 | - | - |
| underbearers | 15 | - | - |
| underbearing | 16 | - | - |
| underbellies | 15 | - | - |
| underbushing | 19 | - | - |
| undercharged | 20 | - | - |
| undercharges | 19 | - | - |
| underdampers | 18 | - | - |
| underdevelop | 19 | process (a film or photographic plate) less than the required time or in an ineffective solution or at an insufficiently high temperature | These photos are underdeveloped |
| underdrained | 15 | - | - |
| underdrawers | 17 | underpants worn by men | - |
| underdrawing | 18 | - | - |
| undercrested | 16 | - | - |
| undercoverts | 18 | - | - |
| underclasses | 15 | - | - |
| underclothed | 19 | inadequately clothed | - |
| underclubbed | 20 | - | - |
| undercooking | 20 | - | - |
| undercooling | 16 | - | - |
| undercounted | 16 | - | - |
| underdresses | 14 | - | - |
| underweights | 20 | - | - |
| undesignedly | 18 | - | - |
