Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To attack as false or questionable; challenge in argument: impugn a political opponent's record.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To assault, attack.
  • v. To verbally assault, especially to argue against an opinion, motive, or action; to question the truth or validity of.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To attack by words or arguments; to contradict; to assail; to call in question; to make insinuations against; to gainsay; to oppose.

from The Century Dictionary and Cyclopedia

  • To attack by words or arguments; contradict; assail; call in question; gainsay.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. attack as false or wrong

Etymologies

Middle English impugnen, from Old French impugner, from Latin impugnāre : in-, against; see in-2 + pugnāre, to fight; see peuk- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin impugnō, from im- + pugnō ("fight"), from pugnus ("fist") (as in English pugilism ("fighting with fists, boxing")), from Proto-Indo-European roots. (Wiktionary)

Examples

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