'Bitter' in the Bible

Now you have with you Shimei, the son of Gera the Benjamite of Bahurim, who put a bitter curse on me on the day when I went to Mahanaim; but he came down to see me at Jordan, and I gave him my oath by the Lord, saying, I will not put you to death by the sword.

Then Ahijah, hearing the sound of her footsteps coming in at the door, said, Come in, O wife of Jeroboam; why do you make yourself seem like another? for I am sent to you with bitter news.

The king of Israel went home to Samaria bitter and angry.

So Ahab went into his palace, bitter and angry that Naboth the Jezreelite had said, "I will not sell to you my ancestral inheritance." He lay down on his bed, pouted, and would not eat.

Then his wife Jezebel came in and said to him, "Why do you have a bitter attitude and refuse to eat?"