"Exitious" is a word in ENGLISH

Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound.

Deadly; fatal; mortal; destructive.

Causing destruction; tending to bring about ruin, death, or devastation; ruinous; fatal; productive of serious evil; mischievous; pernicious; -- often …

Causing death or destruction; deadly; mortal; destructive; calamitous; as, a fatal wound; a fatal disease; a fatal day; a fatal …

The state of being fatal; tendency to destruction or danger, as if by decree of fate; mortaility.

In a manner issuing in death or ruin; mortally; destructively; as, fatally deceived or wounded.

makamamátay - Deadly, deathly, mortal, killing, death-dealing, mortiferous, fatal, destructive of life. (cf. patáy, matáy).

To ravage; to prevail without restraint, or with destruction or fatal effect; as, the plague raged in Cairo.