What is the meaning of infernal?

noun

• An inhabitant of Hell.
  • usage: "his roar made the infernals quake"

adjective

• Characteristic of or resembling Hell.
  • usage: "infernal noise"; "infernal punishment"
• Extremely evil or cruel; expressive of cruelty or befitting hell.
  • usage: "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"
  • synonyms: demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy
• Expletives used informally as intensifiers)
  • usage: "he's a blasted idiot"; "it's a blamed shame"; "a blame cold winter"; "not a blessed dime"; "I'll be damned (or blessed or darned or goddamned) if I'll do any such thing"; "he's a damn (or goddam or goddamned. fool"; "a deuced idiot"; "an infernal nuisance"
  • synonyms: blasted, blame, blamed, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned
• Of or pertaining to or characteristic of a very uncontrolled and intense fire.
  • usage: "infernal heat"
• Being of the underworld.
  • usage: "infernal regions"