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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

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

Wiktionary

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

GNU Webster's 1913

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

WordNet 3.0

  1. v. attack as false or wrong

Etymologies

  1. Middle English impugnen, from Old French impugner, from Latin impugnāre : in-, against; see in-2 + pugnāre, to fight; see peuk- in Indo-European roots.

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‘impugn’ has been looked up 3396 times, loved by 11 people, added to 93 lists, commented on 2 times, and has a Scrabble score of 11.