The Collaborative International Dictionary of English v.0.48:
Slipperiness \Slip"per*i*ness\, n. The quality of being slippery. [1913 Webster]WordNet (r) 3.0 (2006):
slipperiness n 1: a slippery smoothness; "he could feel the slickness of the tiller" [syn: slickness, slick, slipperiness, slip] 2: the quality of being a slippery rascal [syn: rascality, shiftiness, slipperiness, trickiness]