Webster's 1828 Dictionary
SLIPPERINESS
n. 1. The state or quality of being slippery; lubricity; smoothness; glibness; as the slipperiness of ice or snow; the slipperiness of the tongue.
2. Uncertainty; want of firm footing.
3. Lubricity of character.
Webster's 1913 Dictionary
SLIPPERINESS
SLIPPERINESS Slip "per *i *ness, n.
Defn: The quality of being slippery.
New American Oxford Dictionary
slipperiness
slip per i ness |ˈslipərēnis ˈslɪpərinɪs | ▶noun the quality or state of being slippery: a play about the slipperiness of language.
Oxford Dictionary
slipperiness
slip ¦peri |ness |ˈslɪp (ə )rɪnɪs | ▶noun [ mass noun ] the quality or state of being slippery: a play about the slipperiness of language.
Oxford Thesaurus
slipperiness
slipperiness noun 1 the slipperiness of the path: smoothness, slickness, greasiness, oiliness, iciness, glassiness; sliminess, wetness; informal slippiness. 2 his campaign has been hurt not so much by scandal, but by his slipperiness: evasiveness, unreliability, unpredictability; deviousness, craftiness, cunning, wiliness, trickiness, artfulness, guilefulness, slickness, untrustworthiness, duplicitousness, dishonesty, treachery, two-facedness; informal shadiness, shiftiness; rare tergiversation.
The Wordsmith Dictionary