It depends on the specific dictionary what words are illustrated and what words aren't. That said, it's difficult to imagine an illustration for "unlettered," which basically means "uneducated."

$1 unless the edges are unlettered.

It is very rare for a judge to speak in such unlettered terms, but that phrase means "The judge is trying to come to a resolution."

It doesn't matter who the muse is. What Gray is trying to say is that the epitaphs on the gravestones (Their name, their years) is misspelled.

untaught, unschooled, untutored, untrained, unread,unscholarly, illiterate, unlettered, ignorant, ill-informed, uninformed;uncouth, unsophisticated, uncultured, unaccomplished, unenlightened,philistine, benighted, backward, redneck