| ruthless(adjective, hard, tough, severe, cold) |
| serene(adjective, calm, cool, relaxed, indifferent) |
| thick-skinned(adjective, hard, tough, severe, careless) |
| thoughtless(adjective, dull, sharp, rude, careless) |
| tough(adjective, mean, hard, cool, severe) |
| undemonstrative(adjective, calm, dull, cool, flat) |
| unexcited(adjective, calm, cool, relaxed, indifferent) |
| Laodicean(adjective, cold, dead, apathy, passive) |
| blunt(adjective, dull, impassive, unresponsive, insensitive) |
| cheerless(adjective, weary) |
| controlled(adjective, unexcitable) |
| droopy(adjective, dull, flat, low, sad) |
| drugged(adjective, lethargic, insensibility) |
| hebetudinous(adjective, dull, slow, heavy, sluggish) |
| icy(adjective, mean, hard, cool, tough) |
| materialistic(feature, person, character, trait) |
| offhand(adjective, calm, cool, relaxed, indifferent) |
| regardless(adjective, careless, indifferent, detached, distant) |
| sedentary(adjective, inert) |
| stagnant(adjective, dull, quiet, easy, flat) |