'Bitter' in the Bible

Husbands, love your wives, and be not bitter against them.

Doth the fountain send forth from the same opening sweet water and bitter?

But if ye have bitter jealousy and faction in your heart, glory not and lie not against the truth.

and the name of the star is called Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.

And I went unto the angel, saying unto him that he should give me the little book. And he saith unto me, Take it, and eat it up; and it shall make thy belly bitter, but in thy mouth it shall be sweet as honey.

And I took the little book out of the angel's hand, and ate it up; and it was in my mouth sweet as honey: and when I had eaten it, my belly was made bitter.