In an aloof manner; with emotional distance, detachment, or indifference.
From 'aloof' (from Dutch nautical terminology 'af loof') plus the adverbial suffix '-ly.' The original Dutch phrase meant keeping a ship away from the lee, and the metaphorical meaning of emotional distance developed naturally.
The word 'aloof' started as a nautical term about keeping ships away from the shore—and English speakers loved that metaphor so much they turned it into a personality trait meaning 'keeping emotional distance from people!'
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