Equanimity

имя существительное невозмутимость, хладнокровие; спокойствие; самообладание Например: to upset somebody's equanimity — расстроить кого-либо Синоним(ы): composure, presence of mind

Большой англо-русский словарь

Equanimity

noun (plural -ties) Etymology: Latin aequanimitas, from aequo animo with even mind 1. evenness of mind especially under stress Example: nothing could disturb his equanimity 2. right disposition; balance Example: physical 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 Example: 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 Example: maintaining his composure even under hostile questioning. sangfroid implies great coolness and steadiness under strain Example: handled the situation with professional sangfroid.

Merriam-Webster's Collegiate Dictionary