[slip-uh-ree, slip-ree]
adjective, slipperier, slipperiest.
tending or liable to cause slipping or sliding, as ice, oil, a wet surface, etc.: a slippery road.
tending to slip from the hold or grasp or from position: a slippery rope.
likely to slip away or escape: slippery prospects.
not to be depended on; fickle; shifty, tricky, or deceitful.
unstable or insecure, as conditions: a slippery situation.

1525–35; alteration of slipper2; compare Low German slipperig; see -y1

slipperiness, noun
nonslippery, adjective
unslippery, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slippery (ˈslɪpərɪ, -prɪ)
1.  causing or tending to cause objects to slip: a slippery road
2.  liable to slip from the grasp, a position, etc
3.  not to be relied upon; cunning and untrustworthy: a slippery character
4.  (esp of a situation) liable to change; unstable
5.  slippery slope a course of action that will lead to disaster or failure
[C16: probably coined by Coverdale to translate German schlipfferig in Luther's Bible (Psalm 35:6); related to Old English slipor slippery]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1530s, from slip (v.) (cf. O.E. slipor "slippery"). Metaphoric sense of "deceitful" is first recorded 1550s; slippery slope first attested 1951.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The combination of collagen mesh and water forms a strong and slippery pad in
  the joint.
Hot soapy water in a bucket for cleaning slippery hands while bottling.
Rubber trim and bottom are excellent for gripping and setting on slippery
They do so because they're more slippery than prior string designs.
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