In a manner characteristic of someone who is old or aged; with the qualities associated with old age.
From 'aged' (past participle of 'age' or adjective meaning 'old') plus the adverbial suffix '-ly' (from Old English '-lice'). This rare adverb formation follows standard English patterns for creating adverbs from adjectives.
Most people never use 'agedly,' but it exists in the grammar rules—showing how English lets us turn almost any adjective into an adverb, even if nobody really says 'he moved agedly' in conversation!
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