GUILEFUL
crafty, cunning, dodgy, foxy, guileful, knavish, slick, sly, tricksy, tricky, wily
(adjective) 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”
Source: WordNet® 3.1
Etymology
Adjective
guileful (comparative more guileful, superlative most guileful)
Full of guile; treacherously deceptive.
Source: Wiktionary
Guile"ful, a.
Definition: Full of guile; characterized by cunning, deceit, or treachery;
guilty.
– Guile"ful*ly, adv.
– Guile"ful*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition