OT.filter - kjv despair:

kjv@1Samuel:27:1 @ And 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 speedily escape into the land of the Philistines; and Saul shall despair of me, to seek me any more in any coast of Israel: so shall I escape out of his hand.

kjv@Ecclesiastes:2:20 @ Therefore I went about to cause my heart to despair of all the labour which I took under the sun.