WordWeb Online

1. Not straightforward or candid; giving a false appearance of frankness
   "an ambitious, artful, philistine, and hypocritical operator, who...exemplified...the most disagreeable traits of his time"
   - disingenuous
    
2. Marked by skill in achieving a desired end especially with cunning or craft
   "the artful dodger"; "an artful choice of metaphors"

See also: adroit, artfully, artfulness, crafty, cunning, cute, deep, designing, distorted, dodgy [Brit], elusive, foxy, guileful, insincere, knavish, manipulative, misrepresented, pawky [UK, dialect], perverted, precious, scheming, slick, sly, tricksy, tricky, twisted, wily

Antonym: artless