/ Dictionary / Index I impugn: Meaning and Definition of Find definitions for: im•pugn Pronunciation: (im-pyn'), [key] — v.t. to challenge as false (another's statements, motives, etc.); cast doubt upon. to assail (a person) by words or arguments; vilify. to attack (a person) physically. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: impugn (Thesaurus) impudicity impuissant Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language