equanimity
[noun]
Synonyms: ataraxy, calmness, composure, coolness, imperturbability, phlegm, sangfroid, self-possession

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Contrasted words: alarm, anxiety, apprehension, excitability, nervousness, agitation, discomposure, disquiet, disturbance, perturbation
Related Words: balance, equilibrium, equipoise, poise, aplomb, assurance, confidence, self-assurance, detachment, placidity, serenity, tranquillity

[TahlilGaran] English Synonym Dictionary ▲

eq‧ua‧nim‧i‧ty /ˌiːkwəˈnɪməti, ˌiːkwəˈnɪmɪti, ˌekwə-/ noun [uncountable]
[Date: 1600-1700; Language: Latin; Origin: aequanimitas, from aequo animo 'with level mind']
formal calmness in the way that you react to things, which means that you do not become upset or annoyed:
He received the news with surprising equanimity.

[TahlilGaran] Dictionary of Contemporary English ▲