Joseph Smith the Conlanger?

In a recent online discussion, someone quoted a piece from the Book of Mormon
that contained the word "delightsome". I jokingly asked if that's a word (it's
listed in the AHD, but I don't think I had seen it before). In reply, I was
told that Smith had probably invented it himself; at any rate he certainly
invented a lot of English words when he wrote the Book of Mormon.

Now, I wonder if anyone here knows if the word indeed originates in the BoM, if
it's true Smith invented a lot of words (normal words, not names of people and
places) for the BoM, and if any have entered normal usage, within or outside
the Mormon community.

                                              Andreas

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