| ruthless(adjective, hard, tough, severe, cold) |
| sensationless(adjective, hard, tough, severe, cold) |
| senseless(adjective, hard, tough, severe, cold) |
| severe(adjective, hard, tough, cold, cruel) |
| stony(adjective, hard, tough, severe, indifferent) |
| surly(adjective, hard, tough, severe, cold) |
| tactless(adjective, hard, indifferent, unkind, unresponsive) |
| thick-skinned(adjective, hard, tough, severe, indifferent) |
| tough(adjective, hard, severe, indifferent, cruel) |
| unamiable(adjective, hard, tough, severe, cold) |
| uncompassionate(adjective, hard, tough, severe, cold) |
| unconcerned(adjective, hard, indifferent, unkind, unresponsive) |
| uncordial(adjective, hard, tough, severe, cold) |
| unemotional(adjective, hard, tough, severe, cold) |
| unfeeling(adjective, hard, indifferent, cruel, unsympathetic) |
| unkind(adjective, hard, tough, severe, indifferent) |
| unresponsive(adjective, hard, indifferent, unkind, insensitive) |
| unsusceptible(adjective, hard, indifferent, unkind, unresponsive) |
| unsympathetic(adjective, hard, tough, severe, cold) |
| coldblooded(adjective, unfeeling, senseless, numb, hard-hearted) |