He pointed out—writing in a foolish, facetious tone—that the perfection of mechanical appliances must ultimately supersede limbs; the perfection of chemical devices, digestion; that such organs as hair, external nose, teeth, ears, and chin were no longer essential parts of the human being, and that the tendency of natural selection would lie in the direction of their steady diminution through the coming ages.
There are no more uses of "facetious" in the book.
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I trust you didn’t take her facetious remarks seriously.
You must not think me necessarily foolish because I am facetious, nor will I consider you necessarily wise because you are grave.