slipperiest

/S L IH1 P R IY0 AH0 S T/
adjective
  1. 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.

  2. 2

    (by extension) Evasive; difficult to pin down.

    a slippery person

  3. 3

    Liable to slip; not standing firm.

  4. 4

    Unstable; changeable; inconstant.

  5. 5

    Wanton; unchaste; loose in morals.

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Source: https://en.wiktionary.org/wiki/slipperiest, https://en.wiktionary.org/wiki/slippery