Definition of frightful adjective from the Oxford Advanced American Dictionary

     

    frightful

     adjective
    adjective
    NAmE//ˈfraɪtfl//
     
    (old-fashioned)
     
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  1. 1 (informal) used to emphasize how bad something is synonym awful, terrible It was absolutely frightful!
  2. 2very serious or unpleasant synonym awful, terrible a frightful accident
See the Oxford Advanced Learner's Dictionary entry: frightful