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Definition of Deadly
1. Adverb. As if dead.
2. Adjective. Causing or capable of causing death. "A mortal illness"
3. Adverb. (used as intensives) extremely. "Insanely jealous"
4. Adjective. Of an instrument of certain death. "A lethal injection"
5. Adjective. Extremely poisonous or injurious; producing venom. "A virulent insect bite"
6. Adjective. Involving loss of divine grace or spiritual death. "The seven deadly sins"
Category relationships: Divinity, Theology
Similar to: Unpardonable
Derivative terms: Deadliness
7. Adjective. Exceedingly harmful.
Similar to: Noxious
Derivative terms: Deadliness, Perniciousness, Pestilence
8. Adjective. (of a disease) having a rapid course and violent effect.
Definition of Deadly
1. a. Capable of causing death; mortal; fatal; destructive; certain or likely to cause death; as, a deadly blow or wound.
2. adv. In a manner resembling, or as if produced by, death.
Definition of Deadly
1. Adjective. (obsolete) Subject to death; mortal. ¹
2. Adjective. Causing death; lethal. ¹
3. Adjective. (context: by extension) very accurate (of aiming with a bow, firearm, etc.) ¹
4. Adjective. (informal) very boring ¹
5. Adjective. (informal) excellent, awesome, cool ¹
6. Adverb. (obsolete) Fatally, mortally. ¹
7. Adverb. In a way which suggests death. ¹
8. Adverb. Extremely. ¹
¹ Source: wiktionary.com
Definition of Deadly
1. fatal [adj -LIER, -LIEST] - See also: fatal
Medical Definition of Deadly
1.
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.