The minister gave out his text and droned along monotonously through an argument that was so prosy that many a head by and by began to nod —and yet it was an argument that dealt in limitless fire and brimstone and thinned the predestined elect down to a company so small as to be hardly worth the saving.
As the boys steadily and monotonously drove the raft toward mid-stream it was no doubt understood that these orders were given only for "style," and were not intended to mean anything in particular.
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.