slippery

From Middle English slipperie, an extended form ( +‎ -y) of Middle English slipper, sliper (“slippery”), from Old English slipor (“slippery”), from Proto-Germanic *slipraz (“smooth, slippery”), equivalent to slip +‎ -er. Compare also Middle English slibbri, slubbri (“slippery”) borrowed from Middle Dutch or Middle Low German slibberich (“slippery”). Cognate with German schlüpfrig (“slippery”), Danish slibrig (“slippery”), Swedish slipprig (“slippery”).

• IPA^(key): /ˈslɪpəɹi/, /ˈslɪpɹi/

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slippery (comparative slipperier, superlative slipperiest)

1. Of a surface, having low friction, often due to being covered in a non-viscous liquid, and therefore hard to grip, hard to stand on without falling, etc.

   Oily substances render things slippery.

   • 1936, F.J. Thwaites, chapter XXII, in The Redemption, Sydney: H. John Edwards, published 1940, page 214:

     The screeching of brakes, the monotonous blare of motor horns, the clip-clip of shoes on slippery pavements, the rustling of wet mackintoshes were all part of the great metropolis.

2. (figuratively, by extension) Evasive; difficult to pin down.

   a slippery person

   a slippery promise

3. (obsolete) Liable to slip; not standing firm.
   • c. 1602, William Shakespeare, “The Tragedie of Troylus and Cressida”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act III, scene iii], line 84:

     Which when they fall, as being slippery standers, / The love that leaned on them, as slippery too, / Do one pluck down another, and together / Die in the fall.

4. Unstable; changeable; inconstant.
   • 1642, [John Denham], The Sophy. […], 2nd edition, London: […] J[ohn] M[acock] for H[enry] Herringman, […], published 1667, →OCLC, (please specify the page):

     He looking down
     With scorn or pity on the slippery state
     Of kings, will tread upon the neck of fate.

5. (obsolete) Wanton; unchaste; loose in morals.
   • c. 1610–1611 (date written), William Shakespeare, “The Winters Tale”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene ii], line 273:

     My wife is slippery? If thou wilt confess –

• (of a surface): greasy, slick, slimy, slippy, wet

• (of a surface): sticky

• slip