If you don 't overcome this anger, it can turn into bitterness.

如果你不克服这种愤怒，它将转变为积怨。

youdao

But it's also because you don't have the sort of bitterness of the hops balancing the sweetness of the barley and the malt.

NPR: Looking at the World Through Beer Glasses

Don't let your anger or bitterness get the best of you.

FORBES: Careers

Wouldn't an American peace initiative then merely add to the store of bitterness by raising false expectations?

ECONOMIST: Israel and Palestine