guileful vs sly

guileful and sly both are adjectives.

Word	Noun	Adjective	Verb	Adverb
guileful	No	Yes	No	No
sly	No	Yes	No	No

As adjectives, guileful and sly are synonyms defined as:

Other synonyms of guileful include crafty, cunning, dodgy, foxy, knavish, slick, tricksy, tricky, wily.

guileful (adjective)	sly (adjective)
marked by skill in deception	marked by skill in deception