Caleb was in a difficulty known to any person attempting in dark times and unassisted by miracle to reason with rustics who are in possession of an undeniable truth which they know through a hard process of feeling, and can let it fall like a giant’s club on your neatly carved argument for a social benefit which they do not feel.
There are no more uses of "rustic" in the book.
Show samples from other sources
Low-slung brown leather couches with modern lines were coupled with a rustic coffee table on a cow-skin rug.
Nicholas Sparks -- The Longest Ride
It seemed excessively rustic, even for Cairnholm.
Ransom Riggs -- Miss Peregrine’s Home for Peculiar Children