noun (n)

• a feeling of deep and bitter anger and ill-will(noun.feeling)

  Synonym:
  gall, rancor, rancour, resentment
  

  source: wordnet30
• a rough and bitter manner(noun.attribute)

  Synonym:
  acerbity, acrimony, jaundice, tartness, thorniness
  

  source: wordnet30
• the taste experience when quinine or coffee is taken into the mouth(noun.cognition)

  Synonym:
  bitter
  

  source: wordnet30
• the property of having a harsh unpleasant taste(noun.attribute)

  source: wordnet30
• The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; keenness of reproach or sarcasm; deep distress, grief, or vexation of mind.(noun)

  source: webster1913