impugn ( impugns 3rd person present) ( impugning present participle) ( impugned past tense & past participle ) If you impugn something such as someone's motives or integrity, you imply that they are not entirely honest or honourable.
The Secretary's letter questions my veracity and impugns my motives... V n
Translation English Cobuild Collins Dictionary
assail, attack, call into question, cast aspersions upon, cast doubt upon, challenge, criticize, dispute, gainsay (archaic or literary) oppose, question, resist, traduce
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