1. (adj) devilish, diabolic, diabolical, mephistophelian, mephistophelean
showing the cunning or ingenuity or wickedness typical of a devil
Synonyms: mephistophelian, rascally, hellish, unholy, infernal, fiendish, satanic, roguish, diabolic, devilish, mephistophelean, demonic, diabolical
Antonyms: good
2. (adj) demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy
extremely evil or cruel; expressive of cruelty or befitting hell
Synonyms: blasted, mephistophelian, wicked, infernal, damned, diabolic, deuced, beastly, hellish, satanic, blamed, damn, goddam, goddamned, blessed, unhallowed, unholy, blame, god-awful, demonic, darned, diabolical, goddamn, sinful, fiendish, mephistophelean, devilish
Antonyms: good
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Synonyms and Antonyms of diabolical 
