'Bitter' in the Bible

A curse, a curse on Meroz! said the angel of the Lord. A bitter curse on her townspeople! Because they came not to the help of the Lord, to the help of the Lord among the strong ones.

And the children of Dan said to him, Say no more, or men of bitter spirit may make an attack on you, causing loss of your life and the lives of your people.

And the people came to Beth-el, waiting there till evening before God, and gave themselves up to bitter weeping.