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During the Spring and Autumn period, Zai Yu, a disciple of Confucius, was very eloquent and skilled with words. Initially, Confucius was fond of him, believing he would achieve great things.
However, it wasn't long before Confucius found that Zai Yu frequently missed his lessons. When Confucius sent someone to find him, Zai Yu was discovered fast asleep in his room. Learning of this, Confucius felt a profound sadness and remarked, "Rotten wood cannot be carved, and walls made of dung and dirt cannot be whitewashed."

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Open the tool →朽木不雕 (xiǔ mù bù diāo) is a Chinese idiom (chengyu) meaning “a person who is beyond improvement or incapable of being trained due to a lack of potential, diligence, or ambition; someone who is inherently untrainable or unimprovable”.
朽木不雕 is pronounced xiǔ mù bù diāo in Mandarin Chinese.
Literally, 朽木不雕 means “Rotten wood cannot be carved”. It is used to mean “a person who is beyond improvement or incapable of being trained due to a lack of potential, diligence, or ambition; someone who is inherently untrainable or unimprovable”.
朽木不雕 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
朽坏的木头无法雕刻。比喻人不上进,无法成材。