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infernal

[in-fur-nl] /ɪnˈfɜr nl/
adjective
1.
hellish; fiendish; diabolical:
an infernal plot.
2.
extremely troublesome, annoying, etc.; outrageous:
an infernal nuisance.
3.
of, inhabiting, or befitting hell.
4.
Classical Mythology. of or pertaining to the underworld.
Origin
1325-1375
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
Synonyms
2. devilish, cursed, monstrous.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for infernally

infernal

/ɪnˈfɜːnəl/
adjective
1.
of or relating to an underworld of the dead
2.
deserving hell or befitting its occupants; diabolic; fiendish
3.
(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
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Word Origin and History for infernally

infernal

adj.

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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