| sagacious(adjective, reasonable, rational, sober, wise) |
| scientific |
| scientistic |
| secular |
| sedate(adjective, calm, sensible, dark, restrained) |
| serene(adjective, calm, sensible, dark, restrained) |
| serious(adjective, calm, tough, plain, restrained) |
| settled |
| severe(adjective, calm, sensible, dark, restrained) |
| shrewd(adjective, hard, sound, reasonable, sensible) |
| soft(adjective, calm, sensible, dark, restrained) |
| solemn(adjective, calm, sensible, dark, restrained) |
| solid(reasonable, useful, realistic, applied, hands-on) |
| somber(adjective, calm, sensible, dark, restrained) |
| sophisticated |
| sound-thinking |
| staid(adjective, calm, sensible, dark, restrained) |
| stoic(adjective, tough, rational, straightforward, sober) |
| stolid(adjective, tough, rational, straightforward, sober) |
| subdued(adjective, calm, sensible, dark, restrained) |