1. slippery, tricky, untrustworthy (vs. trustworthy), untrusty

usage: not to be trusted; "how extraordinarily slippery a liar the camera is"- James Agee

2. catchy, tricky, difficult (vs. easy), hard

usage: having concealed difficulty; "a catchy question"; "a tricky recipe to follow"

3. crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily, artful (vs. artless)

usage: marked by skill in deception; "cunning men often pass for wise"; "deep political machinations"; "a foxy scheme"; "a slick evasive answer"; "sly as a fox"; "tricky Dick"; "a wily old attorney"

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See also: tricky (Dictionary)