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Definition of guileful : Full of guile; characterized by cunning, deceit, or treachery; guilty.

Synonyms:

rogue, cagey, underhanded, clever, glib, double-dealing, shrewd, means, beguiling, tricksy, satiny, lubricious, honest, cunning, pat, subtle, shady, artful, fast, ability, dodgy, fraudulent, dicey, silklike, slippery, underhand, designing, indirect, scheming, sneaky, chanceful, foxy, silken, devious, disingenuous, knavish, shifty, chancy, crafty, bent, sly, catchy, deceptive, wily, sharp, silky, cute, slick, ingenious, duplicitous, sleek, crooked, tricky

Usage examples:

• Loki became guileful from that wicked woman; thence in the world are all giantesses come. - "The Elder Eddas of Saemund Sigfusson; and the Younger Eddas of Snorre Sturleson", Saemund Sigfusson and Snorre Sturleson.
• Hence it must be that in the former army officer's plan lay some intent more complex than mere open- and- shut meeting and slaying: some carefully planned and guileful climax to be approached by indirection. - "The Law of Hemlock Mountain", Hugh Lundsford.
• You are guileful as a Greek. - "A Victor of Salamis", William Stearns Davis.