slick

Synonyms: glossy greasy icy lubricious oily oleaginous shiny sleek sleeky slippery slithery soapy

Antonyms: coarse rough unpolished

Synonyms: adroit cagey canny deft dextrous foxy glib knowing meretricious plausible professional quick sharp shrewd skillful sly smooth smooth-spoken sophisticated specious streetwise unctuous urbane wise

Antonyms: amateurish clumsy stupid unclever unintelligent