Definition of "Smart" :

noun: a kind of pain such as that caused by a wound or a burn or a sore

verb: be the source of pain

adjective: capable of independent and apparently intelligent action

"Smart weapons."

adjective: improperly forward or bold

adjective: showing mental alertness and calculation and resourcefulness

adjective: elegant and stylish

"A smart new dress."

adjective: quick and brisk

"I gave him a smart salute."

adjective: characterized by quickness and ease in learning

"Smart children talk earlier than the average."

adjective: painfully severe

"He gave the dog a smart blow."