devilishly vs devilish

devilishly is not an adjective while devilish is an adjective.

Word	Noun	Adjective	Verb	Adverb
devilishly	No	No	No	Yes
devilish	No	Yes	No	Yes

As adverbs, devilishly and devilish are synonyms defined as:

devilishly (adjective)	devilish (adjective)
	showing the cunning or ingenuity or wickedness typical of a devil
	playful in an appealingly bold way

devilishly (adverb)	devilish (adverb)
in a playfully devilish manner	in a playfully devilish manner
(used as intensives) excessively
as a devil; in an evil manner