'Bitter' in the Bible

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

And I went to the angel, saying to him to give me the little book. And he says to me, Take 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 hand of the angel, and ate it up; and it was in my mouth as honey, sweet; and when I had eaten it my belly was made bitter.