1. attack as false or wrong
The Collaborative International Dictionary of English v.0.48:
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
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.
The truth hereof I will not rashly impugn, or
overboldly affirm. --Peacham.
WordNet (r) 3.0 (2006):
v 1: attack as false or wrong
Moby Thesaurus II by Grady Ward, 1.0:
73 Moby Thesaurus words for "impugn":
abjure, accuse, anathematize, anathemize, animadvert on, arraign,
assail, assert the contrary, attack, belie, blame,
call in question, call to account, cast blame upon,
cast reflection upon, censure, complain against, condemn, contest,
contradict, contravene, controvert, counter, criminate, cross,
cry down, cry out against, cry out on, cry shame upon, damn, decry,
denounce, denunciate, deny, disaffirm, disallow, disavow, disclaim,
disown, disprove, dispute, forswear, fulminate against, gainsay,
impeach, implicate, incriminate, inculpate, indict,
inveigh against, involve, join issue upon, negate, negative,
not accept, not admit, nullify, oppose, recant, reflect upon,
refuse to admit, refute, renounce, reprehend, reproach, reprobate,
repudiate, retract, revoke, shake up, take back, take issue with,