Lethal
is applied to that which in its nature or purpose is a cause of death a lethal weapon, a lethal dose
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
Fatal
implies the inevitability or actual occurrence of death or disaster a fatal disease, a fatal mistake
Deadly
is applied to a thing that can and probably (but not inevitably) will cause death a deadly poison
Find another word for deadly. In this page you can discover 81 synonyms, antonyms, idiomatic expressions, and related words for deadly, like: fatal, lethal, malignant, murderous, toxic, homicidal, venomous, bloody, deathly, noxious and mortal.
A rifle cracked, piercing the silence with deadly import.
The old Christian eschatology is set aside; no one has dealt such deadly blows to Chiliasm and Christian apocalypticism as Origen.
He got his satchel from the buggy and, opening it, took out two deadly looking revolvers that made the children shrink back in alarm just to look at.
Glancing over his shoulder at his advancing pursuer, he knew he'd have to drop far enough and rapidly enough to pass Shipton before the killer could swing out with his deadly ax.