Wolf in sheep's clothing
形容外表友善、內心險惡的人，偽裝成無害者以欺騙他人。
警告他人提防偽君子。
英文釋義
A person who pretends to be nice but is not
例句
He seemed kind, but turned out to be a wolf in sheep's clothing.
典故來源
源自《伊索寓言》，狼披羊皮混入羊群，比喻偽善者。