| indifferent(adjective, calm, hard, careless, cold) |
| strict(adjective, strong, hard, tough, severe) |
| thick-skinned(noun, adjective, calm, mean, hard) |
| unsentimental(adjective, hard, sound, tough, reasonable) |
| case-hardened(noun, adjective, hard, careless, indifferent) |
| cold(adjective, calm, hard, tough, harsh) |
| hard-nosed(adjective, mean, strong, hard, tough) |
| insensible(adjective, bad, strong, hard, tough) |
| pragmatic(adjective, hard, sound, simple, tough) |
| rough(adjective, person, strong, hard, simple) |
| ruthless(adjective, hard, severe, sharp, rough) |
| stern(adjective, hard, tough, severe, rough) |
| unresponsive(adjective, calm, person, bad, hard) |
| aloof(adjective, calm, hard, indifferent, restrained) |
| cool(adjective, calm, indifferent, restrained, detached) |
| dispassionate(adjective, calm, sensible, cold, cruel) |
| down-to-earth(adjective, calm, hard, sound, simple) |
| hard-bitten(adjective, hard, tough, rough, harsh) |
| inhuman(adjective, bad, hard, cold, cruel) |
| merciless(adjective, person, hard, severe, rough) |