Simple past tense and past participle of impugn.(verb)
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Use "impugned" in a sentence
"His honesty was now in set terms impugned, and on the 15th of February, 1870, he addressed, through the editor of The Pall Mall Gazette, Mr. Frederick Greenwood, a direct challenge to Mr. Philip Harwood, who had become editor of The Saturday Review."
"His honesty was now in set terms impugned, and on the 15th of February, 1870, he addressed, through the editor of The Pall Mall Gazette, Mr. Frederick"
"Picasso's generosity is no way "impugned" by the book's account of his gift of the head of Dora Maar."