tricky

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

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

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"