Owen Flanagan noted in his 1991 book Science of the Mind that some modern thinkers have suggested that consciousness may never be completely explained.
[1] He clarifies this term by stating "But the new mysterianism is a postmodern position designed to drive a railroad spike through the heart of scientism".
Apparently, some apply the terms to thinkers throughout history who suggested some aspect of consciousness may not be knowable or discoverable, including Gottfried Leibniz, Samuel Johnson, and Thomas Huxley.
Thomas Huxley wrote, "[H]ow it is that anything so remarkable as a state of consciousness comes about as a result of irritating nervous tissue, is just as unaccountable as the appearance of the Djinn, when Aladdin rubbed his lamp.
[2]In the view of the new mysterians, their contention that the hard problem of consciousness is unsolvable is not a presupposition, but rather a philosophical conclusion reached by thinking carefully about the issue.