bitterness
//ˈbɪtərnəs//
Noun
bitternessSingular
1
A sharp, acrid taste that is not sweet, sour, or salty.
The bitterness of the dark chocolate was too strong for her.
2
A feeling of deep anger, resentment, or disappointment, often resulting from unfair treatment or betrayal.
She couldn't hide the bitterness she felt after being passed over for the promotion.
3
The quality or state of being harsh, severe, or unpleasant.
The bitterness of the winter cold made it difficult to go outside.