imperturbability Synonyms

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