<p><strong>Adjective:</strong></p><ul><li>hellish</li><li>fiendish</li><li>diabolical: an infernal plot</li><li>extremely troublesome, annoying, etc.; atrocious: an infernal nuisance</li><li>Synonyms: wretched, abominable, damnable, cursed, blasted, accursed</li><li>of, inhabiting, or befitting hell</li><li>of or relating to the underworld</li></ul>