'Despair' in the Bible

David said in his heart, "I shall now perish one day by the hand of Saul. There is nothing better for me than that I should escape into the land of the Philistines; and Saul will despair of me, to seek me any more in all the borders of Israel. So shall I escape out of his hand."

Why are you in despair, my soul? Why are you disturbed within me? Hope in God! For I shall still praise him for the saving help of his presence.

My God, my soul is in despair within me. Therefore I remember you from the land of the Jordan, the heights of Hermon, from the hill Mizar.

Why are you in despair, my soul? Why are you disturbed within me? Hope in God! For I shall still praise him, the saving help of my countenance, and my God.

Why are you in despair, my soul? Why are you disturbed within me? Hope in God! For I shall still praise him: my Savior, my helper, and my God. For the Chief Musician. By the sons of Korah. A contemplative psalm.

Therefore I began to cause my heart to despair concerning all the labor in which I had labored under the sun.