adj. 1 smooth, sleek, glossy, silky, silken, shiny, shining, glassy, slippery His slick hair looked as if it had been greased 2 smooth, urbane, suave, smooth-spoken, glib, smug, plausible; sycophantic, unctuous, Colloq smarmy Thomas was a slick operator and managed to worm his way into a position of power 3 smooth, clever, skilful, adroit, dexterous, professional, ingenious, imaginative, inventive, creative, Colloq neat The performance was slick and well-rehearsed 4 superficial, shallow, meretricious, specious, glib They have made a lot of money publishing slick magazines for the yuppy market
v. 5 Often, slick down. smooth, plaster down, grease, oil He likes his hair slicked down to look like Valentino's