Characterized by sharp quick thought; bright. See Synonyms at intelligent. Amusingly clever; witty: a smart quip; a lively, smart conversation. Impertinent; insolent: That's enough of your smart talk. Energetic or quick in movement: a smart pace. Canny and shrewd in dealings with others: a smart negotiator. Fashionable; elegant: a smart suit; a smart restaurant; the smart set. See Synonyms at fashionable. Capable of making adjustments that resemble human decisions, especially in response to changing circumstances: smart missiles. Manufactured to regulate the amount of light transmitted in response to varying light conditions or to an electronic sensor or control unit: smart windows. New England & Southern U.S. Accomplished; talented: He's a right smart ball player. To cause a sharp, usually superficial, stinging pain: The slap delivered to my face smarted. To be the location of such a pain: The incision on my leg smarts. To feel such a pain. To suffer acutely, as from mental distress, wounded feelings, or remorse: "No creature smarts so little as a fool\u201d ( Alexander Pope). To suffer or pay a heavy penalty. Sharp mental or physical pain. See Synonyms at pain. Slang Intelligence; expertise: a reporter with a lot of smarts. smart off Informal To speak or act impertinently. right smart New England & Southern U.S. A lot; a considerable amount: He did right smart of the work himself.