of, like, or befitting a devil; diabolical; fiendish.

extreme; very great

a devilish mess.

excessively; extremely

He's devilish proud.

adjective

angelic , godlike , good , moral

adjective

accursed , atrocious , bad , brutish , cloven-footed , cursed , damnable , demoniac , demonic , detestable , diabolic , diabolical , evil , execrable , fiendish , hellborn , hellish , infernal , inhuman , iniquitous , mephistophelian , nefarious , satanic , serpentine , unhallowed , villainous , ghoulish , ogreish , satanical , deuced , excessive , extreme , malicious , mischievous , reprobate , wicked