The quality of being calm, balanced, and mentally stable, maintaining equanimity regardless of changing circumstances.
From 'evenminded' + '-ness' (suffix forming abstract nouns). Derives from the concept of 'even' (balanced) + 'minded' (disposed toward), expressing emotional and mental stability.
The ancient Greeks called this quality 'ataraxia'—a state of perfect peace where external events don't disturb your inner calm, which evenmindedness describes in English.
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