guileful
1. [ adjective ] marked by skill in deception
Synonyms: sly crafty wily tricksy knavish foxy slick tricky dodgy cunning
Examples:

"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"

Related terms: artful
Similar spelling:   Guilbeault
  Guilfoyle
  Guilbault