"devilishly" in the adverb sense
1. diabolically, devilishly, fiendishly
as a devil in an evil manner
"his writing could be diabolically satiric"
2. devilishly, devilish
in a playfully devilish manner
"the socialists are further handicapped if they believe that capitalists are not only wicked but also devilishly clever"
3. madly, insanely, deadly, deucedly, devilishly
used as intensives) extremely
"she was madly in love"
"deadly dull"
"deadly earnest"
"deucedly clever"
"insanely jealous"
Source: WordNet® (An amazing lexical database of English)
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