'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.

Then the king of Israel went back to his house, bitter and angry, and came to Samaria.

So Ahab came into his house bitter and angry because Naboth the Jezreelite had said to him, I will not give you the heritage of my fathers. And stretching himself on the bed with his face turned away, he would take no food.

But Jezebel, his wife, came to him and said, Why is your spirit so bitter that you have no desire for food?