In a suspicious, questionable, or fish-like manner.
From 'fishy' + '-ly' (adverbial suffix from Old English 'lice,' like or in the manner of), converting the adjective into an adverb.
This adverb captures wonderfully odd moments in literature—when a character 'fishily glanced around' or 'fishily offered an explanation,' the word itself becomes suspicious and evasive, mirroring the behavior it describes.
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