| sinister(adjective, person, unwarmhearted) |
| spiteful(adjective, person, unwarmhearted) |
| steely(adjective, hostile, unfriendly, aloof, distant) |
| unexcitable(adjective, calm, dull, flat, detached) |
| unflappable(adjective, calm, unemotional, composed, unexcitable) |
| unforthcoming(adjective, person, feelings) |
| vindictive(adjective, person, unwarmhearted) |
| deadpan(adjective, calm, dull, cool, flat) |
| backward(adjective, person, quiet, gentle, feelings) |
| celibate |
| composed(adjective, calm, close, quiet, gentle) |
| disagreeable(adjective, negative, bad behavior) |
| flat(adjective, calm, dull, cool, cold) |
| guarded |
| hibernal |
| hiemal(adjective, cool, severe, keen, sharp) |
| inclement(adjective, cool, severe, keen, sharp) |
| inert(adjective, flat, cold, dead, apathy) |
| inscrutable(adjective, unexcitable) |
| lifeless(adjective, calm, dull, cool, flat) |