adj. 25B6; adjective
a devilish grin : DIABOLICAL, fiendish, demonic, satanic, demoniac, demoniacal; hellish, infernal.
a devilish torture : WICKED, evil, iniquitous, vile, foul, abominable, unspeakable, loathsome, monstrous, atrocious, heinous, hideous, odious, horrible, appalling, dreadful, awful, terrible, ghastly, abhorrent, despicable, depraved, dark, black, immoral; vicious, cruel, savage, barbaric.
a devilish job : DIFFICULT, tricky, ticklish, troublesome, thorny, awkward, problematic.