| case-hardened(adjective, unfeeling, unsympathetic, uncaring, insensitive) |
| churlish(adjective, hard, tough, severe, cold) |
| cold-shoulder(adjective, cool, cold, detached, unfriendly) |
| cold fish(expression, adjective, hard, tough, severe) |
| coldblooded(adjective, hard, unfeeling, heartless, merciless) |
| coldhearted(adjective, hard, unfeeling, frosty, heartless) |
| crotchety(adjective, hard, tough, severe, cold) |
| deadened(adjective, hard, tough, severe, cold) |
| exacting(adjective, hard, tough, severe, cold) |
| feelingless(adjective, hard, tough, severe, cold) |
| formal(adjective, cool, cold, detached, unfriendly) |
| frosty(adjective, cool, cold, detached, unfriendly) |
| hardboiled |
| hellacious(adjective, bad behavior) |
| hostile |
| ill-natured(adjective, bad behavior) |
| impenitent(adjective, hard, cruel, unfeeling, unsympathetic) |
| imperturbable(adjective, cold, unfeeling, unsympathetic, pitiless) |
| impervious |
| implacable |