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[in-fur-nl] /ɪnˈfɜr nl/
hellish; fiendish; diabolical:
an infernal plot.
extremely troublesome, annoying, etc.; outrageous:
an infernal nuisance.
of, inhabiting, or befitting hell.
Classical Mythology. of or relating to the underworld.
Origin of infernal
1325-75; Middle English < Late Latin infernālis, equivalent to Latin infern(us) situated below, of the underworld (see inferior) + -ālis -al1
Related forms
infernality, noun
infernally, adverb
2. devilish, cursed, monstrous. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for infernally
Historical Examples
  • I need not tell you that I am infernally anxious both about the business and my friend.

    The Half-Hearted John Buchan
  • This intuition, or whatever you may call it, is an infernally bad thing for you.

    The Seven Secrets William Le Queux
  • And yet, even as I realized this, I realized also how infernally clever the scheme was.

    The Air Pirate Cyril Arthur Edward Ranger Gull
  • Her dissimulation, he was obliged to perceive, had been infernally deep.

    Embarrassments Henry James
  • Though courier boats make their crews so infernally sick I doubt whether the present type will ever come into common use.

    The Lost Kafoozalum Pauline Ashwell
  • Since he was so infernally independent why didn't he get to work and earn something?

    The Four Pools Mystery Jean Webster
  • He refused to use the boat these days, he said he was so infernally busy that he could not spare the time.

    The Harbor Ernest Poole
  • I feel sorry for her and that's all—deeply and infernally sorry.

    The Harbor Ernest Poole
  • No, she's up again, but she's sartin to be drownded, the infernally young fool!

    The Actress' Daughter May Agnes Fleming
  • He was so infernally certain that the Emperor would wipe the floor with us.

    The Island Mystery George A. Birmingham
British Dictionary definitions for infernally


of or relating to an underworld of the dead
deserving hell or befitting its occupants; diabolic; fiendish
(informal) irritating; confounded
Derived Forms
infernality, noun
infernally, adverb
Word Origin
C14: from Late Latin infernālis, from infernus hell, from Latin (adj): lower, hellish; related to Latin inferus low
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for infernally



late 14c., in reference to the underworld, from Old French enfernal, infernal (12c.), from Late Latin infernalis "of the lower regions," from infernus "hell" (Ambrose), literally "the lower (world)," noun use of Latin infernus "lower, lying beneath," from infra "below" (see infra-). Meaning "devilish, hateful" is from early 15c. For the name of the place, or things which resemble it, the Italian form inferno has been used in English since 1834, from Dante. Related: Infernally.

Online Etymology Dictionary, © 2010 Douglas Harper
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