Then, toward sunset, coming down from the mountain where he had been felling timber, he had been caught by some strayed revellers and drawn into the group by the lake, where Mattie, encircled by facetious youths, and bright as a blackberry under her spreading hat, was brewing coffee over a gipsy fire.
There are no more uses of "facetious" in the book.
Show samples from other sources
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.