Definition of dreadfully adverb from the Oxford Advanced American Dictionary

     

    dreadfully

     adverb
    adverb
    NAmE//ˈdrɛdfəli//
     
     
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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 Learner's Dictionary entry: dreadfully