| uncompassionate(adjective, calm, mean, hard, cool) |
| undisturbed(adjective, feature, state, calm, quiet) |
| unthinking(adjective, sharp, rude, careless, indifferent) |
| unworried(adjective, feature, state, calm, indifferent) |
| apathetical(adjective, temper, cold, negative, dead) |
| deaf(adjective, sharp, rude, indifferent, short) |
| emotionless(adjective, calm, cool, indifferent, unfriendly) |
| free and easy(expression, adjective, idiom, feature, state) |
| halfhearted(adjective, mean, hard, cool, temper) |
| hard-hearted(adjective, calm, indifferent, restrained, detached) |
| inactive(adjective, dull, quiet, cool, weak) |
| inert(adjective, cold, dead, apathy, passive) |
| irresponsible(adjective, feature, state, trait, careful) |
| laid-back(adjective, feature, state, calm, dull) |
| mindless(adjective, indifferent, careful, casual, happy-go-lucky) |
| passionless(adjective, calm, cool, indifferent, detached) |
| ruthless(adjective, insensitive) |
| supine(adjective, dull, weak, easy, slow) |
| tranquil(adjective, feature, state, calm, quiet) |
| unkind(adjective, mean, hard, cool, sharp) |