xiǔ​mù​bù​kě​diāo

you can't make a silk purse out of a sow's ear

朽木不可雕 xiǔ​mù​bù​kě​diāo
you can't make a silk purse out of a sow's ear
(idiom) literally "rotten wood cannot be carved," meaning a person is so worthless or stubborn that they cannot be taught or improved; used to describe someone who is beyond help or lacks any potential

Frequency

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0.061 per million

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Sources

Frequency data
BCC Corpus (BLCU)