INFERNAL Meaning of INFERNAL in English adj. 1 a of hell or the underworld. b hellish, fiendish. 2 colloq. detestable, tiresome. infernally adv.[ ME f. OF f. LL infernalis f. L infernus situated below ] Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012