Another word for deadly
fatal, lethal, murderous, mortal, deathly, poisonous, toxic, homicidal, bloody, noxious, destructive, venomous, deleterious, baleful, malignant, terminal, virulent, injurious, pestilential, pestiferous, death-dealing, carcinogenic, suicidal, bloodthirsty, cannibalistic, life-threatening, killing, baneful, pernicious, harmful, violent, inevitable; see also dangerous 2, destructive 2.
Antonyms healthful*, reviving, beneficial.
deadly is applied to a thing that can and probably (but not inevitably) will cause death a deadly poison; fatal implies the inevitability or actual occurrence of death or disaster a fatal disease, a fatal mistake; mortal implies that death has occurred or is about to occur and is applied to the immediate cause of death he has received a mortal blow; lethal is applied to that which in its nature or purpose is a cause of death a lethal weapon, a lethal dose
Another word for deadlyadjective
Causing or tending to cause death:deathly, fatal, lethal, mortal, vital. See live
Gruesomely suggestive of ghosts or death:cadaverous, deathlike, deathly, ghastly, ghostlike, ghostly, spectral. See live
Extremely destructive or harmful:baneful, malignant, noxious, pernicious, pestilent, pestilential, virulent. See help