deadly

/ˈded-lē/

adjective

  1. likely to cause or capable of producing death

  2. aiming to kill or destroy : implacable

  3. highly effective

deadly poison

deadly mortal fatal lethal mean causing or capable of causing death. deadly applies to an established or very likely cause of death. mortal implies that death has occurred or is inevitable.

adverb

  1. in a manner to cause death : mortally

  2. suggesting death

  3. extremely

noun

  1. belladonna