| still(adjective, calm, quiet, cool, moderate) |
| stolid(adjective, calm, quiet, relaxed, casual) |
| strong-minded |
| strong-willed |
| submissive(adjective, calm, quiet, gentle, restrained) |
| suppressed(adjective, calm, relaxed, tranquil, easygoing) |
| sure of oneself(expression, adjective, idiom, calm, relaxed) |
| tolerant(adjective, calm, quiet, mild, relaxed) |
| unaffected(adjective, calm, cool, steady, tranquil) |
| uncaring(adjective, attitude, cold, unemotional, calmness) |
| uncomplaining(adjective, calm, quiet, gentle, restrained) |
| unconcerned(adjective, calm, quiet, cool, moderate) |
| unconstrained |
| uncritical(mild, relaxed, tolerant, laid-back, permissive) |
| undemanding(mild, relaxed, tolerant, laid-back, permissive) |
| under control(expression, calm, controlled, unflappable, contained) |
| understanding(adjective, calm, quiet, gentle, restrained) |
| unhurried(mild, relaxed, tolerant, laid-back, permissive) |
| unimpressed(adjective, quiet, cool, moderate, gentle) |
| uninhibited(mild, relaxed, tolerant, laid-back, permissive) |