不知好歹 bù zhī hǎo dǎi

bù zhī hǎo dǎi set phrase to not know what is good for oneself; to not know good from evil
Domain: Idiom 成语
Notes: (CC-CEDICT '不知好歹'; Guoyu '不知好歹'; Mathews 1931 '不知好歹', p. 129)