noun

1. A covering of liquid, particularly oil.

   “Careful in turn three — there's an oil slick on the road.”

2. Someone who is clever and untrustworthy.

3. A tool used to make something smooth or even.

Synonyms: slick tire, slick tyre

verb

1. To make slick.

   “The surface had been slicked.”

adjective

1. Slippery or smooth due to a covering of liquid; often used to describe appearances.

   “His large round head was shaved slick.”

2. Appearing expensive or sophisticated.

   “They read all kinds of slick magazines.”

3. Superficially convincing but actually untrustworthy.

   “That new sales rep is slick. Be sure to read the fine print before you buy anything.”