EQUANIMITY
composure, calm, calmness, equanimity
(noun) steadiness of mind under stress; “he accepted their problems with composure and she with equanimity”
Source: WordNet® 3.1
Etymology
Noun
equanimity (countable and uncountable, plural equanimities)
The state of being calm, stable and composed, especially under stress.
Synonyms
• composure
• calmness
• even-mindedness
• See also calm
Source: Wiktionary
E`qua*nim"i*ty, n. Etym: [L. aequanimitas, fr. aequanimus: cf. F.
équanimité. See Equanimous.]
Definition: Evenness of mind; that calm temper or firmness of mind which is
not easily elated or depressed; patience; calmness; composure; as, to
bear misfortunes with equanimity.
Source: Webster’s Unabridged Dictionary 1913 Edition