The adjective incorrigible means someone whose attitude is unacceptable and impossible to change or correct.

Synonyms are hopeless, hardened, incurable, or useless.

The word origins from Old French (mid-14th century) incorrigible meaning “perfect, beyond rebuke or discipline” or directly from Latin incorrigibilis meaning “not to be corrected”. It comes from in– meaning “not, opposite of” plus corrigibilis, from corrigere meaning “to correct”, from com-, intensive prefix plus regere meaning “to lead straight, rule”.

His incorrigible behavior is very annoying.

Being an incorrigible person can cause you many misfortunes.

The incorrigible criminal was back to jail for the n-th time.