slick, slick down, sleek down -- (give a smooth and glossy appearance; "slick one's hair")
Overview of adj slick
The adj slick has 4 senses
slick -- (made slick by e.g. ice or grease; "sidewalks slick with ice"; "roads are slickest when rain has just started and hasn't had time to wash away the oil")
glib, pat, slick -- (having only superficial plausibility; "glib promises"; "a slick commercial")
satiny, sleek, silken, silky, silklike, slick -- (having a smooth, gleaming surface reflecting light; "glossy auburn hair"; "satiny gardenia petals"; "sleek black fur"; "silken eyelashes"; "silky skin"; "a silklike fabric"; "slick seals and otters")
crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily -- (marked by skill in deception; "cunning men often pass for wise"; "deep political machinations"; "a foxy scheme"; "a slick evasive answer"; "sly as a fox"; "tricky Dick"; "a wily old attorney")