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

     

    deadly

     adverb
    adverb
    BrE BrE//ˈdedli//
     
    ; NAmE NAmE//ˈdedli//
     
     
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  1. 1(informal) extremely deadly serious/dull
  2. 2= deathly deadly pale/cold
  3. Word Origin Old English dēadlīc ‘mortal, in danger of death’ (see dead, -ly).
See the Oxford Advanced American Dictionary entry: deadly