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im·pugn

impugn

pronunciation:
ihm pyun
part of speech: transitive verb
inflections: impugned, impugning, impugns
definition: to call into question; challenge or try to discredit.
She impugned my motives, thus damaging my reputation.
antonyms:
advocate, authenticate
similar words:
contest, dispute, oppugn
derivation: impugnable (adj.)