He thought the rural Featherstones very simple absurd people, and they in their turn regarded his "bringing up" in a seaport town as an exaggeration of the monstrosity that their brother Peter, and still more Peter’s property, should have had such belongings.
There are no more uses of "monstrosity" in the book.
Show samples from other sources
The tax system is a monstrosity.
He was not merely a big snake, I thought—he was a circus monstrosity.