bitterness

noun
1
angry and unhappy feelings caused by the belief that you have been treated unfairly
رنجش, کینه
2
the fact of being very serious and unpleasant, with a lot of anger and hate involved
تلخی, کینه, بغض
the bitterness of the conflict/dispute
3
the fact of having a strong, unpleasant taste that is not sweet
تلخی, مزه تلخ
The flowers of the hop plant add bitterness to the beer.