bitterly

Adverb
  1. With bitterness;
    In a resentful manner (synset 400053300)
    "she complained bitterly"
  2. Indicating something hard to accept (synset 400053420)
    "he was bitterly disappointed"
  3. Extremely and sharply (synset 400424346)
    "it was bitterly cold"; "bitter cold"
    same as: bitingly, bitter, piercingly

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