deadly — Defs

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

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).

Phrases & compounds

Deadly nightshade — a poisonous plant; belladonna. See under Nightshade.

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

1.
In a manner resembling, or as if produced by, death; deathly.
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.[Obs.]