The meaning of INFERNAL is of or relating to a nether world of the dead. How to use infernal in a sentence.

INFERNAL definition: hellish; fiendish; diabolical. See examples of infernal used in a sentence.

Serious and unpleasant (Definition of infernal from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

1. hellish; fiendish; diabolical: an infernal plot. 2. extremely troublesome, annoying, etc.; outrageous: an infernal nuisance. 3. of, inhabiting, or befitting hell or the underworld.

Feb 14, 2026 · Adjective infernal (comparative more infernal, superlative most infernal) Of or relating to hell, or the world of the dead; hellish. Synonyms: hellish, helly, stygian; see also Thesaurus: infernal …

Definition of infernal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

WordReference Random House Learner's Dictionary of American English © 2025 in•fer•nal /ɪnˈfɜrnəl/ adj. fiendish; diabolical: an infernal plot. very troublesome; outrageous: an infernal nuisance. of, living …

Infernal definition: Fiendish; diabolical.

3 meanings: 1. of or relating to an underworld of the dead 2. deserving hell or befitting its occupants; diabolic; fiendish 3..... Click for more definitions.

Although it might be used to describe something really hot or something evil, infernal is usually used when someone is complaining about something they really don't like such as the infernal dog next …