in·fer·nal

[in-fur-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:
1325–75; Middle English < Late Latin infernālis, equivalent to Latin infern(us) situated below, of the underworld (see inferior) + -ālis -al1

in·fer·nal·i·ty, noun
in·fer·nal·ly, adverb


2. devilish, cursed, monstrous.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Infernal is always a great word to know.
So is Golden Fleece. Does it mean:
a gigantic hollow wooden horse; when the Trojans took it into Troy, Greek soldiers hidden within it opened the gates to the Greek army and conquered the city
a fleece of pure gold, kept at Colchis by King Ae?tes from whom it was stolen by Jason and the Argonauts with the help of Ae?tes's daughter, Medea
Collins
World English Dictionary
infernal (ɪnˈfɜːnəl) [Click for IPA pronunciation guide]
 
adj
1.  of or relating to an underworld of the dead
2.  deserving hell or befitting its occupants; diabolic; fiendish
3.  informal irritating; confounded
 
[C14: from Late Latin infernālis, from infernus hell, from Latin (adj): lower, hellish; related to Latin inferus low]
 
infer'nality
 
n
 
in'fernally
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

infernal
late 14c., from O.Fr. infernal, from L.L. infernalis "of the lower regions," from infernus "hell" (Ambrose), lit. "the lower (world)," noun use of L. infernus "lower." For the name of the place, or things which resemble it, the It. form Inferno has been used in Eng. since 1834, from Dante.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The two brothers mount it alternately on their return from the infernal regions.
No matter how well-intentioned, those infernal devices get in the way of
  something, usually turn signals.
Today you hear these infernal machines going night and day.
And getting rid of the demon buses has become an infernal task for the
  government.
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