INFERNAL Meaning of INFERNAL in English a. 1.Hellish, Tartarean, Stygian, of hell.2.Diabolical, devilish, demoniacal, fiendish, fiendlike, satanic, atrocious, nefarious, dark, damnable, accursed, abominable. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012