Adverbial bitterly has 3 senses
  1. bitterly, with bitterness - in a resentful manner; "she complained bitterly"
    Derived from adjective bitter1
  2. bitterly - indicating something hard to accept; "he was bitterly disappointed"
    Derived from adjective
    bitter2
  3. piercingly, bitterly, bitingly, bitter - extremely and sharply; "it was bitterly cold"; "bitter cold"
    Derived from adjective bitter7
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