The etymology of this word has always fascinated me.
rube (rube): / roob /
(1) an unsophisticated awkward person, especially from a rural area; someone who is rustic; hick
(2) an inexperienced or naïve person
[From English ‘Rube,’ a nickname associated with the forename Reuben. Its use in this sense probably stems from Reuben being considered a common name among country dwellers.]
Usage: [from Dreamdarkers] I smiled briefly as I realized the old rube possessed a reservoir of character with which I was unacquainted.