| unyielding(adjective, mean, harsh, cruel, vicious) |
| affectless |
| anesthetized(adjective, hard, tough, severe, cold) |
| arctic |
| atrocious(adjective, evil, nasty, harsh, violent) |
| beastly(adjective, harsh, violent, vicious, fierce) |
| bestial(adjective, mean, evil, nasty, harsh) |
| blunt |
| brute(adjective, bad, cold, aloof, no feelings) |
| compassionless(adjective, hard, attitude, cruel, unfeeling) |
| cutthroat(adjective, mean, hard, harsh, cruel) |
| disinterested(adjective, calm, mean, hard, cool) |
| distant(adjective, cool, detached, unfriendly, blank) |
| ferocious(adjective, mean, evil, nasty, harsh) |
| fierce(adjective, mean, evil, nasty, harsh) |
| frosty |
| halfhearted(adjective, mean, hard, cool, temper) |
| heterothermic |
| inflexible(adjective, person, hard, careless, indifferent) |
| insentient(adjective, bad, hard, careless, cold) |