In a bonair manner; courteously, graciously, or with refined bearing.
Formed from 'bonair' plus the adverbial suffix '-ly', a common Germanic formation meaning 'in the manner of.' This creates an adverb describing how an action is performed with grace.
Adding '-ly' to adjectives is one of English's most productive word-building tricks, and bonairly shows how even archaic words could spawn adverbial cousins—a ghost word that likely never appeared in real use!
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