| sober(adjective, calm, cool, tough, rational) |
| stony-hearted(adjective, hard, cold, cruel, unfeeling) |
| straight(detached, neutral, impartial) |
| taciturn(adjective, cool, unfriendly, blank, aloof) |
| tranquil(adjective, calm, quiet, cool, relaxed) |
| unfriendly(adjective, hard, indifferent, restrained, hostile) |
| unimpressionable(adjective, hard, detached, unfeeling, unsympathetic) |
| unmoving(adjective, active, still, motionless) |
| Laodicean(adjective, cold, dead, apathy, passive) |
| blase(adjective, calm, cool, relaxed, cold) |
| bloodless(adjective, unfeeling) |
| coldhearted(adjective, hard, cold, indifferent, detached) |
| cool-headed(adjective, calm, quiet, cool, moderate) |
| equable(adjective, calm, quiet, cool, moderate) |
| even-tempered(adjective, calm, cool) |
| frosty |
| halfhearted(adjective, mean, hard, cool, unpleasant) |
| laid-back(adjective, calm, quiet, cool, moderate) |
| level-headed(adjective, calm, casual, unruffled, nonchalant) |
| lifeless(adjective, calm, dull, tough, flat) |