阴毒 Traditional form: 陰毒 Pinyin (reading): yīndú Definitions: sinister insidious Characters: 阴 - the female principle; dark, shaded; hidden, implicit, secret 毒 - poison, venom; drug, narcotic Traditional characters: 陰 - the female principle; dark, shaded; hidden, implicit, secret 毒 - poison, venom; drug, narcotic