Not easily disturbed or angered; calm and even-tempered; also means uniform or consistent in quality or temperature.
From Latin aequabilis (equal, uniform), derived from aequus (equal). The term originally referred to uniformity and balance, and later evolved to describe a person's temperament that remains steady and unflappable.
Physicians in the 18th and 19th centuries were obsessed with equable temperaments in their patients, believing that emotional evenness was literally healthier than passionate intensity—it shaped everything from medical advice to marriage counseling.
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