slicker (Adjective) — Made slick by e.g. ice or grease. ex. "pavements slick with ice" ex. "roads are slickest when rain has just started and hasn't had time to wash away the oil"
slicker (Adjective) — Having only superficial plausibility. ex. "a slick commercial"
slicker (Adjective) — Having a smooth, gleaming surface reflecting light. ex. "slick seals and otters"
slicker (Adjective) — Marked by skill in deception. ex. "a slick evasive answer"
slicker (Noun) — A macintosh made from cotton fabric treated with oil and pigment to make it waterproof.
slicker (Noun) — A person with good manners and stylish clothing.
slicker (Noun) — Someone who leads you to believe something that is not true.