local yokel

Translations
деревенщина
Despite being called a local yokel, he was surprisingly well-read and knowledgeable.
Несмотря на то, что его называли деревенщиной, он был удивительно начитан и осведомлен.
Definitions
A 'local yokel' is an informal and often humorous or slightly derogatory term used to describe a person from a small town or rural area, typically implying that they are unsophisticated, naive, or unfamiliar with urban ways.