Definition of frightfully adverb from the Oxford Advanced American Dictionary

     

    frightfully

     adverb
    adverb
    NAmE//ˈfraɪtfəli//
     
    (old-fashioned)
     
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  1. 1very; extremely synonym awfully, terribly
  2. 2 I'm frightfully sorry.
See the Oxford Advanced Learner's Dictionary entry: frightfully