In a delighted manner; with great pleasure, joy, or satisfaction expressed openly.
From delighted (past participle of delight, from Old French delite) plus the adverb suffix -ly, creating the adverbial form meaning 'in a delighted way.'
English adverbs using -ly can stack multiple suffixes (delight → delighted → delightedly), creating words that sound increasingly formal and specific the more layers they have—linguists call this 'morphological productivity.'
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