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Meaning of 不知好歹

Lookup via: Pinyin | Radicals
zhī hǎo dǎi
unable to differentiate good from bad (idiom); not to know what's good for one; unable to recognize others' good intentions
Example Sentences
1
Why didn't you know good from bad?
2
Young children are amoral.
3
Was she too stubborn?Shook to jolt head.
4
It is a mistake to lavish kindness to ungrateful people.
5
In fact, he often changes girlfriend, for he doesn't know chalk from cheese.