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She decided to impugn his honesty during the debate.
To challenge or question the truth or validity of something.
He tried to impugn her motives after the decision was made.
The lawyer sought to impugn the witness's credibility.
They did not want to impugn the team's efforts despite the loss.
impugn someone's character
impugn the motives
impugn the validity
challenge
question
dispute