Other Words for Infernal
Infernal as a Noun has these synonyms:
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
Example: She tells everyone that there is an infernal plot against her.
hellish, underworld, nether, Hadean
Example: Virgil was Dante's guide in the infernal regions.