Weak

deficient in magnitude; barely perceptible; lacking clarity or brightness or loudness etc

(used of vowels or syllables) pronounced with little or no stress

overly diluted; thin and insipid

wanting in physical strength

deficient in intelligence or mental power

deficient or lacking in some skill

likely to fail under stress or pressure

not having authority, political strength, or governing power

tending downward in price

wanting in moral strength, courage, or will; having the attributes of man as opposed to e.g. divine beings

lacking bodily or muscular strength or vitality

(used of verbs) having standard (or regular) inflection