For they intended evil against you: they devised a mischievous act, which they are not able to perform.
All Commentaries on Psalms 21:11 Go To Psalms 21
George Leo Haydock
AD 1849
Intended. Hebrew, "turned aside "like a torrent. The Ammonites had violated the law of nations, and had attempted to raise up very powerful enemies to invade David. (Calmet)
Establish. Hebrew leaves the sentence imperfect, to show the utter weakness or impotence of God's enemies. (Berthier)