adjective Slippery or smooth due to a covering of liquid; often used to describe appearances.
This rain is making the roads slick.
adjective Sleek; smooth.
adjective Appearing expensive or sophisticated.
They read all kinds of slick magazines.
adjective Superficially convincing but actually untrustworthy.
That new sales rep is slick. Be sure to read the fine print before you buy anything.
adjective Clever, making an apparently hard task look easy.
Our new process for extracting needles from haystacks is extremely slick.
adjective Extraordinarily great or special.
That is one slick bicycle: it has all sorts of features!
noun A covering of liquid, particularly oil.
Careful in turn three — there's an oil slick on the road.
noun A rapidly-expanding ring of dark water, resembling an oil slick, around the site of a large underwater explosion at shallow depth, marking the progress through the water of the shock wave generated by the explosion.