cunningly vs knavishly

cunningly and knavishly both are adverbs.

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

As adverbs, cunningly and knavishly are synonyms defined as:

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

cunningly (adverb)	knavishly (adverb)
in an subtle, cunning manner	in an subtle, cunning manner
in an attractive manner