Simple past tense and past participle of mispronounce. (verb)
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Use "mispronounced" in a sentence
"He blew up when he heard his name mispronounced that way."
"To hear his name mispronounced might, he felt, precipitate a catastrophe."
"The new Louis with his Court is rolling towards Choisy, through the summer afternoon: the royal tears still flow; but a word mispronounced by Monseigneur d'Artois sets them all laughing, and they weep no more."