In a way that is calm, objective, and not influenced by personal feelings or emotions.
From dis- (opposite) + passionately (with intense feeling). The prefix dis- negates the emotional intensity of 'passionate,' which comes from Latin passio meaning suffering or emotion. This word developed in English during the 17th century to describe rational, detached reasoning.
Scientists and judges use this word when they want to emphasize they're being fair and unbiased. It's fascinating that the word 'passion' originally meant 'suffering' in Latin, so being 'dispassionate' literally means removing suffering from your judgment—pretty poetic for just being objective!
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