Etymology
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devilish (adj.)

late 15c., "characteristic of or befitting the Devil;" see devil + -ish. Related: Devilishly; devilishness. As an adverb, "wickedly," 1610s.

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Definitions of devilish
1
devilish (adj.)
showing the cunning or ingenuity or wickedness typical of a devil;
devilish schemes
Synonyms: diabolic / diabolical / mephistophelian / mephistophelean
devilish (adj.)
playful in an appealingly bold way;
Synonyms: rascally / roguish
2
devilish (adv.)
in a playfully devilish manner;
Synonyms: devilishly
From wordnet.princeton.edu