In a manner that delights or brings joy; with the quality of delighting or bringing pleasure.
From delighting (delight plus -ing) plus the adverb suffix -ly, creating an adverb describing actions or qualities done in a delightful manner.
Adverbs formed from -ing forms (like 'delightingly,' 'charmingly,' 'amusingly') often sound more poetic or literary than adverbs formed directly from adjectives, which is why authors use them to add stylistic color to their writing.
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