Noun bitterness has 4 senses
  1. resentment, bitterness, gall, rancor, rancour - a feeling of deep and bitter anger and ill-will
    --1 is a kind of hostility, enmity, ill will
    --1 has particulars:
     heartburning; sulkiness, huffishness; grudge, score, grievance; envy, enviousness, the green-eyed monster
  2. bitterness, acrimony, acerbity, jaundice - a sharp and bitter manner
    --2 is a kind of disagreeableness
  3. bitter, bitterness - the taste experience when quinine or coffee is taken into the mouth
    --3 is a kind of taste, taste sensation, gustatory sensation, taste perception, gustatory perception
  4. bitterness, bitter - the property of having a harsh unpleasant taste
    --4 is a kind of taste property
    --4 has particulars: acerbity; acridity, acridness