[n] a slippery smoothness; "he could feel the slickness of the tiller" [n] a kind of fluent easy superficiality; "the glibness of a high-pressure salesman" [n] verbal misrepresentation intended to take advantage of you in some way
glibness, hanky panky, hocus-pocus, jiggery-pokery, skulduggery, skullduggery, slick, slip, slipperiness, trickery