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deadly

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.
  3. Subject to death; mortal.
    4. Deadly nightshade (Bot.),
    a poisonous plant; belladonna. See under Nightshade.

adv.
  1. In a manner resembling, or as if produced by, death; deathly.
  2. In a manner to occasion death; mortally.
  3. In an implacable manner; destructively.
  4. Extremely.