1. Of, relating to, or typical of this world; secular.
2. Relating to, characteristic of, or concerned with commonplaces; ordinary.

I quite confidently wrote that "mundane" came into common use after the Harry Potter books, but as she corrected me, that word was, of course, "muggles." Same connotation, different word.

When Bob got up this morning, I asked him if he knew where it came from, and he immediately said that his first knowledge of it was from Piers Anthony's Xanth novel, "A Spell for Chameleon," in which the "ordinary" people lived in a land called Mundania and were, naturally, called Mundanes.

So, the ordinary, the clueless, the mundane.