Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies.

In an implacable manner; destructively.

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

Subject to death; mortal.

In a manner resembling, or as if produced by, death; deathly.

exceedingly harmful

(of a disease) having a rapid course and violent effect

Extremely.

as if dead