The prospect was unlimited, but exceedingly monotonous and forbidding; not the slightest variety that I could see.
Making so long a passage through such unfrequented waters, descrying no ships, and ere long, sideways impelled by unvarying trade winds, over waves monotonously mild; all these seemed the strange calm things preluding some riotous and desperate scene.
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.