In a manner of glutting; excessively or in a glutting way.
From 'glutting' (present participle of glut) plus the adverbial suffix '-ly,' which derives from Old English '-lice,' meaning 'in the manner of.' This creates an adverb describing the manner of action.
Adding '-ly' to almost any adjective or participle automatically creates an adverb in English—a shortcut so efficient that English speakers rarely notice they're following a 900-year-old formula.
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