deadly

deadly is an Adverb

Definition:

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

[2] Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies. Thy assailant is quick, skillful, and deadly. Shak.

[3] Subject to death; mortal. [Obs.] The image of a deadly man. Wyclif (Rom. i. 23). Deadly nightshade (Bot.), a poisonous plant; belladonna. See under Nightshade.