| selfish |
| thick-skinned(adjective, calm, mean, hard, tough) |
| uncompassionate(adjective, mean, hard, tough, severe) |
| unemotional(adjective, mean, hard, tough, severe) |
| barbarous(adjective, mean, hard, tough, evil) |
| cool(adjective, calm, indifferent, restrained, detached) |
| dispassionate(adjective, calm, cold, indifferent, cruel) |
| emotionless(adjective, bad, cold, detached, aloof) |
| flinty(adjective, evil, nasty, harsh, vicious) |
| impassive(adjective, calm, indifferent, restrained, detached) |
| inexorable(adjective, mean, hard, tough, evil) |
| relentless(adjective, mean, hard, tough, evil) |
| thoughtless(adjective, mean, nasty, ill, hostile) |
| unconcerned(adjective, calm, indifferent, restrained, detached) |
| unmoved(adjective, calm, cold, indifferent, cruel) |
| unsparing |
| adamant(adjective, mean, hard, tough, harsh) |
| brutish(adjective, evil, nasty, harsh, vicious) |
| chilly(adjective, person, indifferent, feelings, detached) |
| icy(adjective, person, hard, tough, severe) |