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Use "mousiest" in a sentence
"Erin, the mousiest of the bridesmaids, elbowed Gladys when she noticed, only to find herself subtly rebuked with a withering glare from Cheryl, whose short brown hair and severe temperament remained unchanged for the happy occasion."
"But even the mousiest character is capable of acting out from time to time."
"But even the mousiest specimen will discover his inner manly man when he sees a woman he wants to be with."