不知好歹bùzhīhǎodǎiTop 50000Meanings1. unable to differentiate good from bad (idiom)2. not to know what's good for one3. unable to recognize others' good intentionsCharacters used不no知to know好good歹wickedExamples1这个zhège小孩xiǎohái不知好歹bùzhīhǎodǎi。This child don't know what's coming for him.