equanimity       
noun [ U ]  formal uk/ˌek.wəˈnɪm.ə.ti/ us/ˌek.wəˈnɪm.ə.t̬i/
 (尤指处于震惊、失望或困境时的)镇静,沉着,冷静
a calm mental state, especially after a shock or disappointment or in a difficult situation
  He received the news of his mother's death with remarkable equanimity. 他接到母亲去世的噩耗时表现出惊人的自制力。 
 Three years after the tragedy she has only just begun to regain her equanimity. 悲剧已经过去3年了,她才刚刚开始恢复心情的平静。 
 Synonyms: calm calmnesscomposurecool (CALM) phlegm (CALMNESS) sangfroid