equanimity equanimity /ˌiːkwəˈnɪmɪti/

noun

1. () Steadiness of mind under stress  ( collectedness , unflappability , equanimity , calm , calmness , composure )
   steadiness of mind under stress
    He accepted their problems with composure and she with equanimity
   he accepted their problems with composure and she with equanimity