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Wiktionary
slippiest

a. (en-superlativeslippy)

WordNet
slippy
  1. adj. being such as to cause things to slip or slide; "slippery sidewalks"; "a slippery bar of soap"; "the streets are still slippy from the rain" [syn: slippery] [ant: nonslippery]

  2. [also: slippiest, slippier]

slippiest

See slippy