| merciless(adjective, hard, tough, severe, cold) |
| unemotional(adjective, hard, tough, severe, cold) |
| compassionless(adjective, hard, attitude, cruel, unfeeling) |
| demoniacal(adjective, bad behavior, aroused negative) |
| evil-minded(adjective, bad behavior, aroused negative) |
| hard-boiled(adjective, hard, attitude, cold, cruel) |
| hardhearted(adjective, hard, attitude, cold, cruel) |
| harsh(adjective, hard, cruel, negative, unfeeling) |
| obdurate(adjective, hard, tough, severe, attitude) |
| pitiless(adjective, hard, tough, severe, cold) |
| ruthless(adjective, hard, tough, severe, cold) |
| stony(adjective, hard, tough, severe, cruel) |
| stony-hearted(adjective, cold, cruel, unfeeling, unsympathetic) |
| stonyhearted(adjective, person, attitude, feelings, emotions) |
| thick-skinned(adjective, hard, tough, severe, cruel) |
| unkind(adjective, person, hard, tough, severe) |
| unloving(adjective, person, cold, feelings, detached) |
| unresponsive(adjective, cool, cold, detached, unfriendly) |
| brutal(adjective, hard, tough, severe, cold) |
| diabolical(adjective, bad behavior, aroused negative) |