In a brainy or intelligent manner; in a way that shows cleverness or mental skill.
Adverbial form of 'brainy,' adding the -ly suffix (Old English '-lice') to convert the adjective into an adverb describing how an action is performed.
Adverbs ending in -ly are disappearing from casual speech—people increasingly just say 'talk smart' instead of 'talk smartly.' This word, if used at all, is becoming old-fashioned in everyday conversation.
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