hardened

adjective

1 he was hardened to the violence he had seen and inflicted:

inured, desensitized, deadened, accustomed, habituated, acclimatized, used;

coarsened;

rare indurate.

▷antonyms unaccustomed.

2 a hardened criminal:

inveterate, seasoned, habitual, chronic, compulsive, confirmed, accustomed, dyed-in-the-wool;

through and through;

incorrigible, incurable, irredeemable, impenitent, unreformable, unregenerate, reprobate, obdurate, shameless.

▷antonyms infrequent.

3 the silos are hardened against air attack:

strengthened, fortified, reinforced, toughened, thickened, fortress-like;

literary girded;

rare embastioned.

▷antonyms unfortified.

word toolkit	hardened
See incorrigible.

hardened Oxford Dictionary of English