a hopeless person who cannot be improved; often used in the idiom 朽木不可雕 xiǔ​mù​bù​kě​diāo

to be unable to; to be impossible

to carve or engrave; to decorate with carvings

(literary) particle used at the end of a sentence to indicate a judgment, explanation, or to strengthen an affirmative or interrogative mood; or used mid-sentence after a word or phrase to indicate a pause or emphasize the topic