Slicker

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."

4. (often used sarcastically) Clever, making an apparently hard task easy.

   "Our new process for extracting needles from haystacks is extremely slick."

5. Extraordinarily great or special.

   "That is one slick bicycle: it has all sorts of features!"