| serious(adjective, impassive, deadpan, stony, unsmiling) |
| sober(adjective, calm, detached, unfeeling, unemotional) |
| stony(adjective, impassive, deadpan, unsmiling, straight-faced) |
| uncommunicative(adjective, dull, stiff, impassive, hollow) |
| unflappable(adjective, calm, quiet, cool, indifferent) |
| vacant(adjective, dull, dead, impassive, unresponsive) |
| abstract(adjective, calm, cold, indifferent, detached) |
| apathetic(adjective, quiet, cool, indifferent, detached) |
| cold-blooded(adjective, calm, cool, cold, detached) |
| collected(adjective, calm, cool, indifferent, detached) |
| colorless(adjective, cool, cold, indifferent, detached) |
| composed(adjective, calm, cool, detached, blank) |
| controlled(adjective, unexcitable) |
| demure(adjective, unexcitable) |
| earnest |
| grave |
| impartial(adjective, calm, indifferent, detached, casual) |
| imperturbable(adjective, calm, cool, detached, blank) |
| indifferent(adjective, calm, quiet, cool, cold) |
| inexpressive(adjective, dull, cool, detached, dead) |