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

     

    dreadfully

     adverb
    adverb
    BrE BrE//ˈdredfəli//
     
    ; NAmE NAmE//ˈdredfəli//
     
    (especially British English)
     
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  1. 1extremely; very much I'm dreadfully sorry. I miss you dreadfully.
  2. 2very badly They suffered dreadfully during the war.
See the Oxford Advanced American Dictionary entry: dreadfully