Merriam-Webster's Collegiate® Dictionary, 11th Edition
SMART
I. adjective
Etymology: Middle English smert causing pain, from Old English smeart; akin to Old English smeortan Date: before 12th century making one smart ; causing a sharp stinging, marked by often sharp forceful activity or vigorous strength , brisk , spirited ,
4. mentally alert ; bright , knowledgeable , shrewd ,
5. witty , clever , pert , saucy ,
6. neat , trim , stylish or elegant in dress or appearance, c. appealing to sophisticated tastes, characteristic of or patronized by fashionable society,
7. being a guided missile , operating by automation , intelligent 3, smartly adverb smartness noun
II. intransitive verb
Etymology: Middle English smerten, from Old English smeortan; akin to Old High German smerzan to pain
Date: 13th century
to cause or be the cause or seat of a sharp stinging pain,
2. to feel or endure distress, remorse, or embarrassment , to pay a heavy or stinging penalty ,
III. noun
Date: 13th century
a smarting pain, poignant grief or remorse , intelligence , know-how ,
IV. adverb
Date: 13th century
in a smart manner ; smartly