equanimity

synonyms equanimity, composure, sangfroid mean evenness of mind under stress. equanimity suggests a habit of mind that is only rarely disturbed under great strain <accepted her troubles with equanimity>. composure implies the controlling of emotional or mental agitation by an effort of will or as a matter of habit <maintaining his composure even under hostile questioning>. sangfroid implies great coolness and steadiness under strain <handled the situation with professional sangfroid>.