'Bitter' in the Bible

Husbands, love your wives, and don't be bitter against them.

Does a spring send out from the same opening fresh and bitter water?

But if you have bitter jealousy and selfish ambition in your heart, don't boast and don't lie against the truth.

The name of the star is called "Wormwood." One third of the waters became wormwood. Many people died from the waters, because they were made bitter.

I went to the angel, telling him to give me the little book. He said to me, "Take it, and eat it up. It will make your stomach bitter, but in your mouth it will be as sweet as honey."

I took the little book out of the angel's hand, and ate it up. It was as sweet as honey in my mouth. When I had eaten it, my stomach was made bitter.