/ Dictionary / Index I impuissant: Meaning and Definition of Find definitions for: im•pu•is•sant Pronunciation: (im-py'u-sunt, im"py-is'unt, im-pwis'unt), [key] — adj. lacking strength; feeble; weak. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: impuissant (Thesaurus) impugn impulse Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language