From Longman Dictionary of Contemporary Englishinfernalin‧fer‧nal /ɪnˈfɜːnl $ -ɜːr-/ adjective 1 [only before noun] old-fashionedANGRYANNOY used to express anger or annoyance about something I wish the children would stop that infernal noise.2 literaryAL relating to hell and evil → hell —infernally adverb
Examples from the Corpus
infernal• I can't get this infernal machine to work.Origin infernal (1300-1400) Old French Late Latin infernalis, from infernus “hell” 