In a manner showing that one has been charmed or delighted.
From 'charmed' (past tense of charm) plus -ly adverbial suffix. Charm comes from Old French 'charme,' meaning song or spell, from Latin 'carmen.'
This word shows how English layered different languages together—the French-derived 'charm' gets English past-tense (-ed) and English adverbial (-ly) endings in one word!
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