adjective in·fer·nal \in-ˈfər-nəl\

: of or relating to hell

: very bad or unpleasant

Full Definition of INFERNAL

:  of or relating to a nether world of the dead
a :  of or relating to hell
b :  hellish, diabolical
:  damnable <an infernal nuisance>
in·fer·nal·ly \-nəl-ē\ adverb

Examples of INFERNAL

  1. the infernal regions of the dead
  2. Stop making that infernal racket!

Origin of INFERNAL

Middle English, from Anglo-French enfernal, from Late Latin infernalis, from infernus hell, from Latin, lower, from inferus
First Known Use: 14th century


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