knavishly vs artfully

knavishly and artfully both are adverbs.

Word	Noun	Adjective	Verb	Adverb
knavishly	No	No	No	Yes
artfully	No	No	No	Yes

As adverbs, knavishly and artfully are synonyms defined as:

Other synonyms of knavishly include craftily, cunningly, foxily, slyly, trickily.

knavishly (adverb)	artfully (adverb)
in an subtle, cunning manner	in a manner exhibiting art or skill
	in a disingenuous manner
	in an subtle, cunning manner