阴毒 yīndú sinister Origin Definitions Defs Strokes Stroke Words Sentences Sents yīndú sinister 阴 陰 yīn nounadjective hidden hidden; secret; covert; sinister; treacherous毒 dú adjective cruel cruel; malicious; fierce; intenseyīndú [yin-poisoning] 阴 陰 yīn Yin (philosophy) the female, passive, or negative principle in nature (as opposed to Yang)毒 dú harmful influence harmful or corrupting ideas, practices, or remnants from the past