| heartless(adjective, cool, detached, blank, sober) |
| ho-hum(adjective, boring, lifeless, puny, lackluster) |
| homey(adjective, simple, easy, plain, modest) |
| humane(adjective, calm, quiet, cool, soft) |
| iceberg(adjective, calm, detached, sober, unfeeling) |
| icy(adjective, cool, detached, blank, sober) |
| immovable(adjective, cool, detached, blank, sober) |
| impartial(adjective, calm, detached, sober, unfeeling) |
| impassive(adjective, calm, cool, relaxed, detached) |
| impersonal(adjective, calm, cool, detached, blank) |
| imperturbable(adjective, calm, cool, relaxed, detached) |
| improv(adjective, simple, plain, relaxed, straightforward) |
| in cold blood(expression, adjective, idiom, cool, detached) |
| inconspicuous(adjective, simple, plain, relaxed, straightforward) |
| incurious(adjective, calm, cool, relaxed, indifferent) |
| insociable(adjective, cold, modest, unfriendly, aloof) |
| intimate(adjective, simple, easy, plain, relaxed) |
| irresponsible(adjective, feature, state, trait) |
| jubilant(adjective, feature, state, trait) |
| judicial(adjective, calm, detached, sober, unfeeling) |