1The historian's controversial thesis was impugned by several prominent scholars, who questioned the accuracy of her sources.
2Is it fair to impugn the motives of a politician simply because their policies are unpopular?
3The defense attorney sought to impugn the credibility of the prosecution's key witness, highlighting inconsistencies in their testimony.
4The philosopher's argument was impugned by critics who argued that it relied on a flawed assumption.
5There is a fine line between constructive criticism and impugning someone's character; the former aims to improve, while the latter seeks to destroy.