| passionless(adjective, calm, dull, flat, detached) |
| passive(adjective, calm, dull, flat, unemotional) |
| relentless(adjective, animal, mean, hard, harsh) |
| rough(adjective, person, feelings, emotions, rocky) |
| savage(adjective, animal, mean, hard, tough) |
| stonyhearted(adjective, coldhearted) |
| unmoved(adjective, mean, hard, cool, unpleasant) |
| unsympathizing(adjective, mean, unkind, coldhearted) |
| untouched(adjective, mean, hard, feelings, unsympathetic) |
| adamant(adjective, person, mean, hard, feelings) |
| bloodthirsty(adjective, pitiless) |
| cutthroat(adjective, pitiless) |
| demoniac(adjective, pitiless) |
| disagreeable(adjective, coldhearted) |
| disinterested(adjective, calm, dull, mean, hard) |
| frigid(adjective, calm, dull, mean, hard) |
| icy(adjective, mean, hard, cool, tough) |
| impassive(adjective, calm, hard, careless, indifferent) |
| inclement |
| incompatible(adjective, coldhearted) |