From WordNet (r) 3.0 (2006):
slickness
n 1: verbal misrepresentation intended to take advantage of you
in some way [syn: trickery, hocus-pocus, slickness,
hanky panky, jiggery-pokery, skulduggery,
skullduggery]
2: a kind of fluent easy superficiality; "the glibness of a
high-pressure salesman" [syn: glibness, slickness]
3: a slippery smoothness; "he could feel the slickness of the
tiller" [syn: slickness, slick, slipperiness, slip]