'Bitter' in the Bible

If, to avoid breaking the Law of Moses, a man undergoes circumcision on the Sabbath, why are you angry with Me for making a man’s whole body well on the Sabbath?

Now Herod [Agrippa I] was extremely angry with the people of Tyre and Sidon; and their delegates came to him in a united group, and after persuading Blastus, the king’s chamberlain [to support their cause], they asked for peace, because their country was fed by [imports of grain and other goods from] the king’s country.

And I often punished them [making them suffer] in all the synagogues and tried to force them to blaspheme; and in my extreme rage at them, I kept hunting them even to foreign cities [harassing and persecuting them].

that I have great sorrow and unceasing anguish in my heart.

but the former preach Christ [insincerely] out of selfish ambition [just self-promotion], thinking that they are causing me distress in my imprisonment.

Husbands, love your wives [with an affectionate, sympathetic, selfless love that always seeks the best for them] and do not be embittered or resentful toward them [because of the responsibilities of marriage].

Just consider and meditate on Him who endured from sinners such bitter hostility against Himself [consider it all in comparison with your trials], so that you will not grow weary and lose heart.

See to it that no one falls short of God’s grace; that no root of resentment springs up and causes trouble, and by it many be defiled;

For you know that later on, when he wanted [to regain title to] his inheritance of the blessing, he was rejected, for he found no opportunity for repentance [there was no way to repair what he had done, no chance to recall the choice he had made], even though he sought for it with [bitter] tears.

Does a spring send out from the same opening both fresh and bitter water?

But if you have bitter jealousy and selfish ambition in your hearts, do not be arrogant, and [as a result] be in defiance of the truth.

The name of the star is Wormwood; and a third of the waters became wormwood, and many people died from the waters, because they had become bitter (toxic).