In a peaceful, quiet manner without agitation or strong emotion.
From the adjective 'calm' plus the adverbial suffix '-ly'. 'Calm' derives from Old French 'calme', ultimately from Greek 'kauma' meaning 'heat of the day', when winds typically die down.
The word 'calm' originally referred to the still, windless period during the hottest part of the day when even the sea becomes placid. This meteorological observation became a metaphor for emotional tranquility.
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