'Impugn' definitions:

Definition of 'impugn'

From: WordNet
verb
Attack as false or wrong

Definition of 'Impugn'

From: GCIDE
  • Impugn \Im*pugn"\, v. t. [imp. & p. p. Impugned; p. pr. & vb. n. Impugning.] [OE. impugnen, F. impugner, fr. L. impugnare; in on, against + pugnare to flight. See Pugnacious.] To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose; as, to impugn a person's integrity. [1913 Webster]
  • The truth hereof I will not rashly impugn, or overboldly affirm. --Peacham. [1913 Webster]

Synonyms of 'impugn'

From: Moby Thesaurus