sly sly /ˈslaɪ/

adjective

1. () Marked by skill in deception  ( cunning , dodgy [Informal, British] , foxy , crafty , guileful , knavish , slick , tricksy , tricky , sly , wily )
   marked by skill in deception
    Cunning men often pass for wise
   cunning men often pass for wise
    Deep political machinations
   deep political machinations
    A foxy scheme
   a foxy scheme
    A slick evasive answer
   a slick evasive answer
    Sly as a fox
   sly as a fox
    Tricky Dick
   tricky Dick
    A wily old attorney
   a wily old attorney