| hardened(noun, verb, adjective, set, strong) |
| set(verb, adjective, firm, solid, hardened) |
| callous(noun, adjective, hard, unfeeling, unsympathetic) |
| indurated(verb, adjective, set, hard, unfeeling) |
| insensitive(noun, adjective, hard, unfeeling, unsympathetic) |
| inured(noun, adjective, hard, unfeeling, unsympathetic) |
| thick-skinned(noun, adjective, hard, unfeeling, unsympathetic) |
| toughened(noun, verb, adjective, set, hard) |
| tough(noun, adjective, strong, hard, unfeeling) |
| calloused |
| case-hardened(noun, adjective, hard, unfeeling, unsympathetic) |
| casehardened(adjective, hard, unfeeling, unsympathetic, hardened) |
| hard(adjective, strong, solid, stiff, unfeeling) |
| impervious(noun, insensibility) |
| pachydermatous(noun, insensibility) |
| seasoned(adjective, strong, hard, stiff, unfeeling) |
| calcified(adjective, set, firm, solid, hardened) |
| firmed |
| flinty(adjective, strong, hard, solid, stiff) |
| hard-boiled(noun, adjective, hard, unfeeling, unsympathetic) |