a man who behaves in a dishonest or unfair way 卑鄙的人;粗鄙的人;無賴 He’s no gentleman; he’s a cad! 他可不是正經人,他是個無賴。
Word Originlate 18th cent. (denoting a passenger picked up by the driver of a horse-drawn coach for personal profit): abbreviation of caddie or cadet.