| uncaring(adjective, indifferent, unconcerned, passive, listless) |
| wooden(adjective, dull, quiet, cool, flat) |
| boneheaded |
| callous(noun, adjective, dull, quiet, cool) |
| composed(adjective, calm, quiet, cool, relaxed) |
| dead in the water |
| disinterested(adjective, calm, indifferent, aloof, unconcerned) |
| distant(adjective, indifferent, casual, aloof, unemotional) |
| dopey(adjective, dull, simple, slow, stupid) |
| emotionless(adjective, calm, dull, cool, tough) |
| flat(adjective, calm, dull, quiet, tough) |
| insouciant |
| lackadaisical(adjective, dull, weary, apathetic, tired) |
| languid(adjective, dull, quiet, flat, slow) |
| mindless(adjective, dull, unintelligent, witless) |
| moronic(adjective, dull, simple, slow, foolish) |
| numb(noun, adjective, unexcitable) |
| opaque(adjective, dull, insensitive, simple-minded, dull-witted) |
| reserved(adjective, cool, indifferent, casual, blank) |
| serene(adjective, calm, quiet, cool, relaxed) |