adj. 25B6; adjective INVETERATE, habitual, confirmed, hardened, incurable, irredeemable, hopeless, beyond hope, beyond redemption; impenitent, uncontrite, unrepentant, unapologetic, unashamed.
INCORRIGIBLE
Meaning of INCORRIGIBLE in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012