| reasoned(adjective, sound, reasonable, sensible, rational) |
| sagacious(adjective, sound, reasonable, reason, sensible) |
| sage(adjective, sound, reason, sensible, rational) |
| salubrious |
| sapient(adjective, sound, reason, sensible, rational) |
| solid(adjective, open, reasonable, firm, honest) |
| all there(expression, adjective, calm, good, sound) |
| assured(adjective, calm, quiet, relaxed, casual) |
| dispassionate(adjective, calm, quiet, cool, reasonable) |
| equable(adjective, calm, quiet, cool, reasonable) |
| far-sighted(adjective, calm, sound, reasonable, sensible) |
| farsighted(adjective, reasonable, keen, deep, rational) |
| hard(sound, tough, reasonable, sensible, practical) |
| level |
| level headed(expression, idiom) |
| normal(sound, reasonable, sensible, rational, healthy) |
| philosophical(adjective, calm, quiet, relaxed, thoughtful) |
| relaxed(adjective, calm, quiet, cool, moderate) |
| reliable(adjective, good, open, firm, honest) |
| reposeful(adjective, quiet, cool, still, peaceful) |