| imperturbable(adjective, calm, quiet, cool, smooth) |
| calm(adjective, calm, quiet, cool, reasonable) |
| cool(adjective, calm, quiet, reasonable, sensible) |
| composed(adjective, calm, quiet, cool, smooth) |
| serene(adjective, calm, quiet, cool, moderate) |
| unruffled(adjective, calm, quiet, cool, smooth) |
| collected(adjective, calm, quiet, cool, reasonable) |
| easygoing(adjective, calm, cool, attitude, relaxed) |
| self-possessed(adjective, calm, quiet, cool, reasonable) |
| stoic(adjective, calm, cool, blank, aloof) |
| nonchalant(adjective, calm, cool, relaxed, steady) |
| confident(informal, adjective, confidence, sureness) |
| dispassionate(adjective, calm, quiet, cool, moderate) |
| even-tempered(adjective, calm, cool, sound, smooth) |
| placid(adjective, calm, quiet, cool, smooth) |
| easy(adjective, calm, cool, attitude, relaxed) |
| controlled(adjective, reserved, unexcitable) |
| impassive(adjective, calm, quiet, cool, moderate) |
| peaceful(adjective, calm, quiet, cool, still) |
| sedate(adjective, calm, quiet, cool, moderate) |