Having the qualities or characteristics of a bumpkin; rustic, unsophisticated, or lacking refinement in manner or taste.
From 'bumpkin' (a country person, origin uncertain but possibly from Dutch 'bommekijn') plus the suffix '-ish' meaning having the character of.
This word perfectly captures how city people used language to look down on country people—adding '-ish' made it extra dismissive, like saying 'sort of crude!'
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