In a skillful, clever, and graceful manner, especially with quick and clever movements or actions.
From dextrous + -ly (adverb suffix from Old English). The adverbial form appeared alongside dextrous in English and maintained the sense of skillful execution.
Magicians use sleight of hand—from the old word 'sleight' meaning trickery—and they perform their tricks dextrously, which is why we fall for the illusion!
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