impugn

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impugn /ɪmˈpjuːn/ verb
impugns; impugned; impugning
impugn
/ɪmˈpjuːn/
verb
impugns; impugned; impugning
Learner's definition of IMPUGN
[+ object] formal
: to criticize (a person's character, intentions, etc.) by suggesting that someone is not honest and should not be trusted