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Adjective: sly (slyer,slyest,slier,sliest)  slI
  1. Marked by skill in deception
    "sly as a fox";
    - crafty, cunning, dodgy [Brit], foxy, guileful, knavish, slick, tricksy, tricky, wily

Derived forms: slyest, slyer, sliest, slier

See also: artful

Encyclopedia: Sly, Slick and Wicked