Meanings
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1
noun
a person who challenges the truth, validity, integrity, or reputation of someone or something
The claim's most persistent impugner demanded independent evidence.
Thesaurus
Etymology
From impugn + -er. Impugn comes from Latin impugnare, 'to attack,' formed from in-, 'against,' and pugnare, 'to fight.' The suffix -er names the person who makes such a challenge or attack.