It was a sensation which broke the monotony of life.
But he went on, in a monotonous, terrified insane mumble.
Babbitt could hear the soldiers’ monotonous orders: "Keep moving—move on, ’bo—keep your feet warm!"
When the other sages of the Pullman smoking-compartment had left them to themselves, Babbitt’s voice did not drop into the playful and otherwise offensive tone in which one addresses children but continued its overwhelming and monotonous rumble, and Ted tried to imitate it in his strident tenor: "Gee, dad, you certainly did show up that poor boot when he got flip about the League of Nations!"
There are no more uses of "monotonous" in the book.
Show samples from other sources
The cafeteria food is good, but it gets monotonous after a while.