Definition of infernal

• an inhabitant of hell; "his roar made the infernals quake"
• characteristic of or resembling hell; "infernal noise"; "infernal punishment"
• extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces"