imperturbability Synonyms

coolness imperturbableness even temper tranquillity stoicism serenity self-possession sang-froid restraint rest repose quiet tranquilness impassiveness tranquility unflappability presence of mind level-headedness cool-headedness composedness sangfroid peace of mind self-assurance peacefulness presence poise placidness cool composure collectedness coldness calmness calm balance ataraxy ataraxia assurance countenance dispassion placidity phlegm patience nonchalance indifference impassivity equilibrium equanimity equability ease aplomb