A sharp and unpleasant taste; the quality of having a bitter flavor. The bitterness of the medicine made it hard to swallow.
A feeling of deep anger and resentment, often resulting from perceived unfair treatment or disappointment. Years after the argument, she still felt a lingering bitterness toward her former friend.
The quality of being harsh or severe, especially in climate or weather. The bitterness of the winter wind made it difficult to stay outside for long.