smart -- (showing mental alertness and calculation and resourcefulness)
chic, smart, voguish -- (elegant and stylish; "chic elegance"; "a smart new dress"; "a suit of voguish cut")
bright, smart -- (characterized by quickness and ease in learning; "some children are brighter in one subject than another"; "smart children talk earlier than the average")
fresh, impertinent, impudent, overbold, smart, saucy, sassy, wise -- (improperly forward or bold; "don't be fresh with me"; "impertinent of a child to lecture a grownup"; "an impudent boy given to insulting strangers"; "Don't get wise with me!")
smart -- (painfully severe; "he gave the dog a smart blow")
smart -- (quick and brisk; "I gave him a smart salute"; "we walked at a smart pace")
smart -- (capable of independent and apparently intelligent action; "smart weapons")