| impartial(adjective, calm, detached, sober, unfeeling) |
| impersonal(adjective, calm, detached, unfriendly, sober) |
| impervious(adjective, calm, restrained, subdued, impassive) |
| in equilibrium |
| indulgent(adjective, calm, quiet, gentle, restrained) |
| inhibited(adjective, calm, cool, sensible, dark) |
| inhuman(adjective, cold, cruel, unfeeling, unsympathetic) |
| inirritable |
| insensible(adjective, cool, blank, aloof, unemotional) |
| judicial(adjective, calm, detached, sober, unfeeling) |
| just(adjective, calm, detached, sober, unfeeling) |
| keeping a stiff upper lip(expression, adjective, idiom, calm, relaxed) |
| lackadaisical(adjective, calm, cool, relaxed, casual) |
| laid back(expression, adjective, calm, cool, relaxed) |
| lenient(adjective, calm, quiet, gentle, restrained) |
| level |
| listless(adjective, calm, quiet, cool, moderate) |
| long-suffering(adjective, calm, quiet, cool, gentle) |
| low-key(adjective, calm, quiet, cool, sensible) |
| lucid(adjective, calm, sensible, dark, restrained) |