John Gill Bible Commentary

Who rejoice to do evil,.... At the doing of it, or when they have done it; they are glad of an opportunity of doing mischief, and glory when they have done it; it is a sport and pastime to them, Pro 10:2; they take pleasure in the act of sin, and have no remorse of conscience afterwards; they speak of it in an exulting manner, and boast of it, and glory in their shame; and delight in the frowardness of the wicked: of the wicked man, as Aben Ezra and Gersom supply it; in the perversities and contradictions of every wicked man; they not only take pleasure in their own sins, but in the sins of others, and in them that commit them; which is an aggravation of their wickedness, Rom 1:32; they delight to hear a man speak froward and perverse things; things against God, and Christ, and religion, against all good men, and everything that is good; against the Gospel, the doctrines and ordinances of it; and they delight to see him do things perverse and contrary to the will of God. The Vulgate Latin version renders it, "they exult in the worst things".