a calm mental state, especially after a shock or disappointment or in a difficult situation(尤指处于震惊、失望或困境时的)镇静,沉着,冷静
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。