Nouns

(n)slickness, slick, slipperiness, slipa slippery smoothness“he could feel the slickness of the tiller”
(n)slick, slick magazine, glossya magazine printed on good quality paper
(n)slicka film of oil or garbage floating on top of water
(n)slicka trowel used to make a surface slick

Verbs

(v)slick, sleekmake slick or smooth
(v)slick, slick down, sleek downgive a smooth and glossy appearance“slick one's hair”

Adjectives

(s)slickmade 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”
(s)facile, neat, slicksuperficially impressive, but lacking depth and attention to the true complexities of a subject“too facile a solution for so complex a problem”, “it was a neat plan, but bound to fail”, “a slick advertising campaign”
(s)glib, pat, slickhaving only superficial plausibility“glib promises”, “a slick commercial”
(s)satiny, sleek, silken, silky, silklike, slickhaving a smooth, gleaming surface reflecting light; being of a smooth, soft and lustrous quality, resembling silk“satiny gardenia petals”, “sleek black fur”, “silken eyelashes”, “silky skin”, “a silklike fabric”, “slick seals and otters”, “silky auburn hair”
(s)crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wilymarked by skill in deception“cunning men often pass for wise”, “a foxy scheme”, “a slick evasive answer”, “sly as a fox”, “tricky Dick”, “a wily old attorney”