WordWeb Online

1. A kind of fluent easy superficiality
   "the slickness of a high-pressure salesman";
   - glibness
    
2. Dishonest and underhand behaviour
   - trickery, hocus-pocus, hanky-panky, jiggery-pokery [informal], skulduggery, skullduggery, sculduggery
    
3. A slippery smoothness
   "he could feel the slickness of the tiller";
   - slick, slipperiness, slip

Type of: deceit, deception, misrepresentation, shallowness, smoothness, superficiality