In a bonny manner; beautifully, attractively, or pleasantly; in a way that is healthy and vibrant.
From 'bonny' plus the adverb-forming suffix '-ly', creating an adverbial form that describes actions or states in the manner of being bonny.
When something is done 'bonnily'—dressing bonnily, dancing bonnily—it conveys not just prettiness but also a kind of confident, healthy joy that English adverbs rarely capture so well!
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