不识好歹不識好歹

bù shí hǎo dǎi

Meaning

unable to tell good from bad (idiom); undiscriminating

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Characters

不bùno, not, un-; negative prefix一识shíknowledge; to understand, to recognize, to know讠只好hǎogood, excellent, fine; proper, suitable; well女子歹dǎicorpse; death; evil, depraved, wicked一夕