不bat1知zi1好hou2歹daai2

bat1 zi1 hou2 daai2inferredbù zhī hǎo dǎi

English

unable to differentiate good from bad (idiom)
not to know what's good for one
unable to recognize others' good intentions

Examples

这个小孩不知好歹。
This child don't know what's coming for him.
Tatoeba · U2FS CC BY

Sources: cc-cedict, synthesized

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