artfully vs knavishly

artfully and knavishly both are adverbs.

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

As adverbs, artfully and knavishly are synonyms defined as:

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

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