In a soft, fluffy, or downy manner; with a quality resembling down feathers.
Adverbial form of 'downy,' created by adding the '-ly' suffix (Old English 'lice') to transform the adjective into an adverb describing manner or quality.
This adverb is quite rare in modern English, showing how some potential words exist in our grammar but rarely get used because 'softly' or 'fluffily' work better in practice!
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