What is another word for "incorrigible"?

Roget's Thesaurus (1911) lists these synonyms for "incorrigible": and, benefit, clergy, conscience, contrition, die, game, graceless, hard, harden, hardened, hardness, heart, impenitence, impenitent, induration, irreclaimable, irrepentance, lack, lost, make, obduracy, obdurate, recusant, relentless, remorseless, seared, sign, steel, the, unregenerate, without.