[ 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

in·fer·nal·i·ty, nounin·fer·nal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for infernal

British Dictionary definitions for infernal


/ (ɪnˈfɜːnəl) /


of or relating to an underworld of the dead
deserving hell or befitting its occupants; diabolic; fiendish
informal irritating; confounded

Derived Forms

infernality, nouninfernally, adverb

Word Origin for infernal

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