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Webster 1913 Edition

Adj.

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

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Guile′ful-ly

adv.

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Guile′ful-ness

Noun.

Adj.

Cunning; drafty; artful; wily; deceitful; insidious; as a guileful person.

Treacherous; deceitful.

Intended to deceive; as guileful words.

guileful ‎(comparative more guileful, superlative most guileful)

full of guile