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

     

    fantastically

     adverb
    adverb
    BrE BrE//fænˈtæstɪkli//
     
    ; NAmE NAmE//fænˈtæstɪkli//
     
     
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  1. 1(informal) extremely well synonym brilliantly (2) You did fantastically.
  2. 2(informal) to an extremely large degree synonym enormously, incredibly fantastically successful
  3. 3very strangely synonym weirdly a fantastically shaped piece of stone