Notwithstanding Miss Pross’s denial of her own imagination, there was a perception of the pain of being monotonously haunted by one sad idea, in her repetition of the phrase, walking up and down, which testified to her possessing such a thing.
The figure in the chair between them, was all the time monotonously rocking itself to and fro, and moaning.
There are no more uses of "monotonous" in the book.
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The cafeteria food is good, but it gets monotonous after a while.