New Living Translation
Although they plot against you, their evil schemes will never succeed.

American Standard Version
For they intended evil against thee; They conceived a device which they are not able to perform.

Berean Study Bible
Though they intend You harm, the schemes they devise will not prevail.

Douay-Rheims Bible
For they have intended evils against thee: they have devised counsels which they have not been able to establish.

English Revised Version
For they intended evil against thee: they imagined a device, which they are not able to perform.

King James Bible
For they intended evil against thee: they imagined a mischievous device, which they are not able to perform.

World English Bible
For they intended evil against you. They plotted evil against you which cannot succeed.

Young's Literal Translation
For they stretched out against Thee evil, They devised a wicked device, they prevail not,

Psalm 21:11 Additional Translations ...