'Bitter' in the Bible

And when she came to where the man of God was on the hill, she put her hands round his feet; and Gehazi came near with the purpose of pushing her away; but the man of God said, Let her be, for her soul is bitter in her; and the Lord has kept it secret from me, and has not given me word of it.

For the Lord saw how bitter was the trouble of Israel, and that everyone was cut off, he who was shut up and he who went free, and that Israel had no helper.

Against whom have you said evil and bitter things? against whom has your voice been loud and your eyes lifted up? even against the Holy One of Israel.

O Lord, keep in mind how I have been true to you with all my heart, and have done what is good in your eyes. And Hezekiah gave way to bitter weeping.