composure

/kəm-ˈpō-zhər/

noun

  1. a calmness or repose especially of mind, bearing, or appearance : self-possession

The witness started to break down, then paused and regained her composure.

equanimity composure sangfroid mean evenness of mind under stress. equanimity suggests a habit of mind that is only rarely disturbed under great strain. composure implies the controlling of emotional or mental agitation by an effort of will or as a matter of habit.

idiom

  1. to remain calm : to not become upset or angry

He kept his cool even though it was clear that he was being unfairly treated.

idiom

  1. to become angry