It would be monstrously unfair.
There is a class of men in Bristol monstrously prejudiced against Blandly.
you are monstrously audacious, how dare you misappropriate public funds?
The Kremlinpropaganda machine has used it to stoke xenophobia: Saakashvili is a monster, it says, so the West is monstrously cynical in backing him.
O why have you treated me so monstrously, Angel!
Your husband's family has behaved monstrously.