INFERNAL

adj. 1 hellish, underworld, nether, Hadean Virgil was Dante's guide in the infernal regions 2 devilish, diabolic(al), demonic(al), demoniac(al), fiendish, satanic, Mephistophelian; damnable, damned, execrable, malicious, malevolent, maleficent, wicked, evil, iniquitous, flagitious, villainous, heinous, dire, sinister, dreadful She tells everyone that there is an infernal plot against her