Dead″ly (?), a. 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.
The image of a deadly man. Wyclif (Rom. i. 23).
Deadly nightshade(Bot.), a poisonous plant; belladonna. See under Nightshade.