| dull(noun, adjective, quiet, rough, low) |
| tough(noun, adjective, mean, hard, cool) |
| unemotional(adjective, dull, mean, hard, cool) |
| hardhearted(adjective, person, hard, careless, cold) |
| impassive(adjective, dull, hard, temper, careless) |
| inhuman(adjective, mean, bad, hard, tough) |
| cool(adjective, mean, hard, temper, unpleasant) |
| cruel(adjective, person, mean, hard, cool) |
| hardened(noun, adjective, hard, tough, severe) |
| thoughtless(adjective, mean, sharp, rough, harsh) |
| dead(adjective, dull, quiet, flat, cold) |
| hard-boiled(noun, adjective, bad, hard, careless) |
| senseless(adjective, bad, hard, tough, severe) |
| stony(adjective, mean, hard, cool, tough) |
| uncompassionate(adjective, mean, hard, cool, tough) |
| anesthetized(adjective, hard, tough, severe, cold) |
| merciless(adjective, hard, tough, severe, harsh) |
| ruthless(adjective, hard, tough, severe, harsh) |
| stupid(adjective, dull, sharp, rough, careless) |
| tactless(adjective, hard, wrong, sharp, rough) |