American Standard Version
Therefore I turned about to cause my heart to despair concerning all the labor wherein I had labored under the sun.

Berean Study Bible
So my heart began to despair over all the labor that I had done under the sun.

Douay-Rheims Bible
Wherefore I left off and my heart renounced labouring any more under the sun.

English Revised Version
Therefore I turned about to cause my heart to despair concerning all the labour wherein I had laboured under the sun.

King James Bible
Therefore I went about to cause my heart to despair of all the labour which I took under the sun.

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

Young's Literal Translation
And I turned round to cause my heart to despair concerning all the labour that I laboured at under the sun.

Ecclesiastes 2:20 Additional Translations ...