It would be monstrously unfair.

那将太不公平了。

Your husband's family has behaved monstrously.

你婆家人做得太不公正了。

Monstrously inflated costs are designed to keep the hoi polloi at bay.

天价被设计用来让小老百姓们不敢问津。

The clown wore a monstrously absurd costume.

小丑戴着一个假鼻子。

O why have you treated me so monstrously, Angel!

啊，安琪尔呀，为什么你待我这样无情无义啊！