Etymology
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slippery (adj.)

"having a slippery surface," c. 1500, from Middle English sliper (adj.) "readily slipping," from Old English slipor "slippery, having a smooth surface" (see slip (v.)) + -y (2). Metaphoric sense of "deceitful, untrustworthy" is first recorded 1550s. Related: Slipperiness. In a figurative sense, slippery slope is first attested 1844. Slippery elm (1748) so called for its mucilaginous inner bark.

updated on October 12, 2013

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Definitions of slippery from WordNet

slippery (adj.)
causing or tending to cause things to slip or slide;
slippery sidewalks
a slippery bar of soap
Synonyms: slippy
slippery (adj.)
not to be trusted; "how extraordinarily slippery a liar the camera is"- James Agee;
Synonyms: tricky
From wordnet.princeton.edu, not affiliated with etymonline.