Main entry: equanimity, composure, calm, calmness
Definition: steadiness of mind under stress
Usage: he accepted their problems with composure and she with equanimity
Antonyms: discomposure
Definition: a temperament that is perturbed and lacking in composure
Main entry: calmness
Definition: a feeling of calm; an absence of agitation or excitement
Antonyms: agitation
Definition: the feeling of being agitated; not calm