Tricky
WordNet
adjective
(1) 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"
(2) Having concealed difficulty
"A catchy question"
"A tricky recipe to follow"
(3) Not to be trusted
"How extraordinarily slippery a liar the camera is"- James Agee