What is another word for "deadly"?

Roget's Thesaurus (1911) lists these synonyms for "deadly": and, azotic, blanket, book, boring, catching, caught, cold, commonplace, contagion, contagious, conte, damp, dearth, death, deleterious, depress, ditch, dry, dull, dullness, dust, ear, epidemic, epizootic, fact, fall, flat, flatness, heaviness, heavy, humdrum, importance, indigestible, infectious, infestivity, innutritious, insalubrious, insalubrity, insipid.