| hardened(adjective, hard, careless, indifferent, cruel) |
| hard-boiled(noun, adjective, hard, careless, indifferent) |
| inured(noun, adjective, hard, careless, indifferent) |
| callous(noun, verb, adjective, dull, hard) |
| hard(adjective, careless, indifferent, cruel, apathetic) |
| insensitive(noun, adjective, hard, careless, indifferent) |
| set |
| thick-skinned(noun, adjective, hard, careless, indifferent) |
| toughened(noun, adjective, hard, careless, indifferent) |
| heartless(adjective, hard, careless, indifferent, cruel) |
| obdurate(adjective, hard, careless, indifferent, cruel) |
| steeled(noun, adjective, hard, unfeeling, unsympathetic) |
| accustomed(adjective, hard, unfeeling, unsympathetic, prepared) |
| calcified(verb, adjective, calcify, curdled, calloused) |
| calloused(verb, calcify, curdled, densify) |
| fossilized(verb, calcify, curdled, calloused, densify) |
| hardhearted(adjective, hard, careless, indifferent, cruel) |
| impervious |
| indurate(verb, adjective, dull, develop, blunt) |
| indurated(adjective, hard, careless, indifferent, cruel) |