In a besotted manner; foolishly, drunkenly, or with foolish infatuation.
From 'besotted' (past participle of 'besot' used as adjective) plus the adverbial suffix '-ly,' which transforms adjectives into adverbs.
The suffix '-ly' transforms virtually any adjective into an adverb in English—one of our most productive morphological rules—allowing us to endlessly create new ways to describe how something is done!
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