equanimity
definition
mental calmness and composure in difficult situations
example
Despite the chaos around her, she faced the challenges with remarkable equanimity, refusing to let her emotions sway her judgment.
synonyms
calmnesscomposureserenity
word origin — From Latin 'aequanimitas' meaning 'evenness of mind', from 'aequus' (even) + 'animus' (mind, spirit).