| torpid(adjective, hard, careless, indifferent, cruel) |
| toughened(adjective, hard, careless, indifferent, cruel) |
| unaffected(adjective, hard, tough, careless, indifferent) |
| unashamed(adjective, hard, unfeeling, unsympathetic, hardened) |
| unbending(adjective, hard, rough, harsh, careless) |
| uncompassionate(adjective, hard, careless, indifferent, cruel) |
| unconcerned(adjective, hard, careless, indifferent, cruel) |
| uncontrite(adjective, hard, tough, harsh, cruel) |
| unemotional(adjective, hard, tough, unfeeling, unsympathetic) |
| unfeeling(adjective, hard, tough, careless, indifferent) |
| unforgiving(adjective, hard, tough, severe, rough) |
| unimpressionable(adjective, hard, careless, indifferent, cruel) |
| unmerciful(adjective, hard, tough, harsh, cruel) |
| unregenerate(adjective, hard, tough, harsh, cruel) |
| unremitting(adjective, hard, tough, harsh, cruel) |
| unrepenting(adjective, hard, tough, grim, unfeeling) |
| unresponsive(adjective, hard, careless, indifferent, cruel) |
| unsubmissive(adjective, hard, unfeeling, unsympathetic, hardened) |
| unsusceptible(adjective, hard, careless, indifferent, cruel) |
| unsympathetic(adjective, hard, careless, indifferent, cruel) |