| reserved(adjective, calm, cool, indifferent, restrained) |
| ruthless(adjective, cold, cruel, unfeeling, unsympathetic) |
| self-controlled(adjective, calm, cool, tolerant, enduring) |
| severe(adjective, calm, restrained, subdued, impassive) |
| silent(adjective, indifferent, detached, distant, apathetic) |
| smooth(adjective, quiet, cool, still, peaceful) |
| solid |
| static(calm, still, lifeless, inactive, inert) |
| statuelike(adjective, firm, stable) |
| steady(adjective, calm, cool, restrained, unconcerned) |
| stern |
| still as death(expression, idiom, quiescence) |
| stock-still(adjective, calm, still, lifeless, inactive) |
| stubborn(adjective, cold, indifferent, determined, fixed) |
| unalterable(determined, fixed, stubborn) |
| unanimated(adjective, insensibility) |
| uncharitable(adjective, mean, hard, feelings, unsympathetic) |
| undemonstrative(adjective, cool, unfriendly, aloof, distant) |
| unflappable(adjective, calm, quiet, cool, moderate) |
| unflinching(adjective, determined, fixed, stubborn) |