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
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."