a. 1. Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound. [ 1913 Webster ]
2. Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies. [ 1913 Webster ]
Thy assailant is quick, skillful, and deadly. Shak. [ 1913 Webster ]
3. Subject to death; mortal. [ Obs. ] [ 1913 Webster ]
The image of a deadly man. Wyclif (Rom. i. 23). [ 1913 Webster ]
Deadly nightshade (Bot.), a poisonous plant; belladonna. See under Nightshade. [ 1913 Webster ]
adv. 1. In a manner resembling, or as if produced by, death; deathly. “Deadly pale.” Shak. [ 1913 Webster ]
2. In a manner to occasion death; mortally. [ 1913 Webster ]
The groanings of a deadly wounded man. Ezek. xxx. 24. [ 1913 Webster ]
3. In an implacable manner; destructively. [ 1913 Webster ]
4. Extremely. [ Obs. ] “Deadly weary.” Orrery. “So deadly cunning a man.” Arbuthnot. [ 1913 Webster ]