Richard is frequently called a monster and related to "monstrous" acts.
Such a monstrous act produced disorder, chaos, and even revolution.
Russell Whitaker, guilty of a monstrous act, is himself no monster.
And for all I know, it was a crime, a monstrous, indecent act.
Places exist where monstrous acts have been committed in the past.
You say we carried out a monstrous act of terrorism.
We'd been part of a monstrous act, and Percy was going to get away with it.
When Michael orders the murder of his own brother, a weak, pathetic figure, we understand why, but it's still a monstrous act.
He was merely the first innocent victim in a monstrous act.
Not knowing why someone commits a monstrous act can only be maintained for short periods.