In a fleece-like, soft, or woolly manner; with a quality resembling fleece.
From 'fleecy' (adjective) plus the adverbial suffix '-ly,' which transforms adjectives into adverbs describing how an action is performed or how something exists.
The existence of 'fleecily' is wonderfully specific—it lets poets and descriptive writers say a cloud moved 'fleecily' across the sky, painting a picture with one word that would otherwise need a whole phrase.
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