bitterness

noun4

1. •
   The quality of having a bitter taste.
2. •
   The quality of feeling bitter; acrimony, resentment; the quality of exhibiting such feelings.

   • She kept her bitterness about her mistreatment for the rest of her life.
3. •
   The quality of eliciting a bitter, humiliating or harsh feeling.

   • Nothing could assuage the bitterness of their defeat.
4. •
   Harsh cold.

   • The bitterness of the winter caught us all by surprise.