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Adverb: vastly  vãst-lee
  1. To an exceedingly great extent or degree
    "He had vastly overestimated his resources";
    - immensely, gigantically, colossally
     
  2. To a great extent; over a large range or scale
    "salaries vary vastly";
    - enormously, terrifically [informal], tremendously, hugely, immensely, massively [informal], greatly