| self-assured(adjective, calm, relaxed, tranquil, easygoing) |
| self-controlled(adjective, calm, quiet, reasonable, moderate) |
| self-restrained(pleasant, reasonable, agreeable, restrained, sober) |
| tranquil(adjective, calm, quiet, cool, relaxed) |
| undisturbed(adjective, quiet, cool, moderate, gentle) |
| unperturbed(calm, composed, poised) |
| valid(adjective, good, open, honest, sensible) |
| well-balanced(rational, stable, wise, shrewd, visionary) |
| well-founded(adjective, reason, sane) |
| well-grounded(adjective, reason, sane) |
| abnegating(adjective, calm, quiet, reasonable, sensible) |
| absorbed(adjective, reasonable, keen, deep, rational) |
| abstaining(adjective, calm, quiet, reasonable, sensible) |
| advisable(adjective, good, sound, sensible, fair) |
| aloof(adjective, calm, quiet, cool, moderate) |
| amiable(adjective, quiet, cool, moderate, gentle) |
| amicable(adjective, quiet, cool, moderate, gentle) |
| analytical(adjective, sound, reasonable, keen, sensible) |
| arguable(adjective, sound, sensible, rational, intelligent) |
| astute(adjective, hard, sound, tough, reasonable) |