Definition of "slippery"

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.

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

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.

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, [Act III, scene iii], line 84

He looking downWith scorn or pity on the slippery stateOf kings, will tread upon the neck of fate.

1641 (first performance), [John Denham], The Sophy. […], 2nd edition, London: […] J[ohn] M[acock] for H[enry] Herringman, […], published 1667, (please specify the page)

My wife is slippery? If thou wilt confess –

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, [Act I, scene ii], line 273