equanimity
US /ˌek.wəˈnɪm.ə.t̬i/
UK /ˌek.wəˈnɪm.ə.t̬i/
1.
mental calmness, composure, and evenness of temper, especially in a difficult situation
:
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She faced the crisis with remarkable equanimity.
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Maintaining equanimity in the face of adversity is a sign of strength.