| passionless(adjective, calm, dull, quiet, cool) |
| slack(noun, adjective, dull, quiet, easy) |
| uninvolved(adjective, calm, dull, quiet, flat) |
| weary(adjective, dull, cool, weak, easy) |
| benumbed(adjective, dull, hard, tough, severe) |
| blase(adjective, calm, cool, relaxed, cold) |
| careless(noun, adjective, calm, dull, hard) |
| chilly(adjective, person, cool, indifferent, feelings) |
| dopey(adjective, dull, weak, easy, flat) |
| dry(adjective, calm, dull, cool, tough) |
| halfhearted(adjective, mean, hard, cool, temper) |
| hard-boiled(adjective, person, hard, tough, careless) |
| hard-hearted(adjective, hard, tough, severe, cold) |
| hardened(adjective, person, hard, cool, tough) |
| heedless(noun, adjective, dull, sharp, rude) |
| impartial(adjective, indifferent, detached, casual, aloof) |
| inanimate(adjective, dull, hard, tough, severe) |
| leaden(adjective, dull, quiet, weak, easy) |
| lumpish(adjective, dull, slow, heavy, sluggish) |
| stoical(adjective, calm, cool, indifferent, restrained) |