不知好歹

bù zhī hǎo dǎi

Definitions

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

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Child Words of 不知好歹

no; not so

not to know

good

to be fond of; to have a tendency to; to be prone to

good and bad

bad

to know