devilishly

adverbs

as a devil; in an evil manner

"his writing could be diabolically satiric"

is derived from

in a playfully devilish manner

"the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"

devilish, devilishly

is derived from

(used as intensives) extremely

"she was madly in love"; "deadly dull"; "deadly earnest"; "deucedly clever"; "insanely jealous"

deadly, deucedly, devilishly, insanely, madly