What it names now
In ordinary American and British English, smart most often means mentally quick: a smart student, a smart choice, a mind that sees the angle. It can also mean stylish, as in a smart coat or the smart set; brisk, as in a smart pace; or cheeky, as in a warning not to get smart. Applied to machines, it marks gadgets and weapons that adjust themselves with sensors and code. The verb is narrower and older in feel. Eyes smart from smoke. A slap smarts. Pride can smart after a snub. Those uses are not slang add-ons. They are the oldest living core of the word.
Inherited, not borrowed
English did not take this adjective or verb from French or Latin. It inherited both from Germanic. Old English had the verb smeortan, used of wounds that hurt with a sharp, local sting rather than a dull ache. The adjective smeart described hits, rods, and similar blows that produced that sting. Middle English carried the pair forward as smerten and as smert or smart.
How early the forms are attested is a small point of disagreement among dictionaries. Historical surveys treat both verb and adjective as Old English, from before 1150. One major American dictionary dates the adjective before the twelfth century but the verb only from the thirteenth. That is a difference in first surviving citations, not a later foreign source. The Oxford record classifies the adjective as a native Germanic word, an ablaut partner of the verb: same West Germanic stem, different vowel grade.
A surname Smart is already visible in the late twelfth century, and as a name-element even earlier. That is social history more than semantics, but it shows the form was ordinary English, not a learned import.
Cognates that still mean pain
The family is easy to see on the Continent. German schmerzen is to ache or hurt; Schmerz is pain. Dutch has the verb smarten and the noun smart. Danish smerte and Swedish smärta cover much the same ground. Older witnesses include Old High German smerzan and smerzo, Middle Dutch smerten and smerte, and Scots smert. An Old Frisian adjective smert, meaning sharp or painful, is sometimes cited. Other accounts say the English adjective itself has no close twins in the sister languages, while the verb and the pain-noun do. Either way, the shared picture is sting, not intellect.
The West Germanic verb is reconstructed as smertan, from Proto-Germanic smertaną. Beyond that the trail splits. One reconstruction sets a Proto-Indo-European root meaning to bite or sting. Another, more cautious, notes a possible link with Latin mordere, to bite, and with a wider root meaning to rub away or to harm. That Latin match is offered as a maybe. Nobody needs it to tell the English story. The Germanic evidence already gives a bite.
There is no prefix or suffix to unpack. The word is a short native root. Folk tales that would derive it from a clever person’s name, or from a French fashion term, do not fit the record.
How a sting became a compliment
The move from pain to brains is a chain of sharpness. Around 1300, words themselves could be smart: harsh, injurious, then cutting. Early modern English kept that edge in sarcastic speech. Impudence followed. A smart remark could be witty and also rude. By the 1620s a person could be smart in the sense of quick, active, clever — explained either as cutting wit or as keenness in a bargain. The 1630s add pert, even impertinent. The warning not to get smart still lives on that branch.
Fashion is later and separate. Eighteenth-century cant used the adjective for fashionably elegant. By the 1790s it could mean trim in dress. Over the nineteenth century the sense is described as climbing from kitchen talk into drawing rooms. Today a smart suit and the smart set still carry social polish rather than measured intelligence.
Devices come last. By 1972 a smart bomb or a smart terminal was one that behaved as if guided by intelligence. The slang plural smarts for good sense is recorded around 1968. An American newspaper figure, the smart cookie, is in print by 1926.
The noun for pain is medieval: late twelfth-century smerte for a sharp bodily hurt, and by about 1300 for mental suffering. That noun never vanished; it simply sits beside the later slang plural. English ran a parallel course with sharp: sting, then keenness of mind, then style. German Schmerz and Dutch smart did not take that last leap. They stayed with hurt.
Pungency, vigor, and intensity were way-stations. Before the intelligence sense settled in the late sixteenth century, the adjective could mark a brisk pace, a drink’s bite, a vigorous blow. Those senses make the later clever reading less mysterious. Anything that cuts, quickens, or stings could wear the same label.
A German reminder
Listen to the verb if you want the oldest picture. A cut still smarts. Smoke still makes the eyes smart. German Schmerz never recast the family as a compliment. English did, and then hung new senses on the same short root: clothes, cheek, circuitry. The origin of the word smart is that sting. The cleverness is a later polish.