Adverb
(used as intensives) extremely
in a playfully devilish manner
as a devil; in an evil manner
Source: WordNetIf you are anything like me --- Clever, fond of goat cheese, and devilishly handsome --- then you have undoubtedly read many books. Brandon Sanderson
I am devilishly afraid, thats certain but ... Ill sing, that I may seem valiant. John Dryden
she was madly in love Source: Internet
deadly dull Source: Internet
deadly earnest Source: Internet
deucedly clever Source: Internet