| secure(adjective, firm, solid, stable, fixed) |
| self possessed(expression, idiom) |
| sensible(adjective, calm, firm, solid, relaxed) |
| serious-minded(adjective, firm, sensible, solid, steady) |
| settle(verb, calm, quiet, cool, relax) |
| silent(adjective, quiet, aloof, peaceful, reticent) |
| simple(quiet, modest, meek, unassuming, retiring) |
| sincere(adjective, set, severe, honest, thoughtful) |
| stayed(verb, dejection, excitability) |
| stoical(adjective, calm, cool, smooth, still) |
| straight |
| straight-faced |
| stupefy(verb, quiet, fix, hit, drug) |
| subdued(adjective, calm, dull, quiet, reasonable) |
| tire(verb, bore, numb, anesthetize) |
| unemotional(adjective, quiet, cool, moderate, gentle) |
| unexcitable(adjective, calm, quiet, cool, moderate) |
| unresponsive(adjective, calm, close, quiet, gentle) |
| weary(verb, bore) |
| abnegating(adjective, calm, quiet, reasonable, sensible) |