Webster's Revised Unabridged Dictionary · 1913

deadly

deadly , adjective

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. — Shakespeare
3.
Subject to death; mortal. [Obsolete]
The image of a deadly man. — Wyclif (Rom. i. 23)
Collocations (1)
Deadly nightshade (Botany) , a poisonous plant; belladonna. See under Nightshade.

deadly , adverb

1.
In a manner resembling, or as if produced by, death; deathly.
Deadly pale. — Shakespeare
2.
In a manner to occasion death; mortally.
The groanings of a deadly wounded man. — Ezek. xxx. 24
3.
In an implacable manner; destructively.
4.
Extremely. [Obsolete]
Deadly weary. — Orrery
So deadly cunning a man. — Arbuthnot