smooth or glossy, as hair, an animal, etc.

well-fed or well-groomed.

trim and graceful; finely contoured; streamlined

a sleek sports car.

smooth in manners, speech, etc.; suave.

cleverly or deceitfully skillful; slick

a sleek confidence man.

adjective

dull , raised , rough , ungroomed , unkempt

adjective

glassy , glistening , lustrous , polished , satin , shiny , silken , silky , satiny , streamlined , trim , fulsome , oily , oleaginous , smarmy , adroit , attractive , chic , chisel , clever , crafty , cunning , fashionable , gloss , glossy , ingenious , polish , preen , slick , slide , slippery , smart , smooth , stylish , suave , unctuous

verb

buff , burnish , furbish , glaze , polish , shine

phrasal verb

explain away , gloss over , gloze , palliate , whitewash