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Definition of deadly adjective from the Oxford Advanced Learner's Dictionary

deadly

adjective
 
/ˈdedli/
 
/ˈdedli/
(comparative deadlier, superlative deadliest)
More deadly and deadliest are the usual forms. You can also use most deadly.
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  1. causing or likely to cause death synonym lethal
    • a deadly weapon/disease
    • He was charged with possession of a deadly weapon.
    • deadly poison
    • The cobra is one of the world's deadliest snakes.
    • The terrorists have chosen to play a deadly game with the civilian population.
    • (figurative) The loss of skills training was deadly for the economy.
    Topics Dangerb2
  2. [only before noun] extreme; complete
    • I'm in deadly earnest.
    • We sat in deadly silence.
    • They are deadly enemies (= are full of hatred for each other).
    • The missile found its target with deadly accuracy.
  3. extremely effective, so that no defence is possible
    • His aim is deadly (= so accurate that he can kill easily).
    • It was the deadly striker's 11th goal of the season.
    • The man possessed an absolutely deadly charm.
  4. (informal) very boring
    • The lecture was absolutely deadly.
  5. (also more frequent deathly)
    like a dead person; suggesting death
  6. Word OriginOld English dēadlīc ‘mortal, in danger of death’ (see dead, -ly).
See deadly in the Oxford Advanced American DictionarySee deadly in the Oxford Learner's Dictionary of Academic English
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