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English word boorish comes from English -ish, English boor
-ish (English)
(appended to adjectives) Somewhat.. (appended to many kinds of words) Typical or similar to.. (appended to numbers, especially times and ages) About, approximately.. (appended to roots denoting names of nations or regions) Of a nationality, place, language or similar association with something.
boor (English)
A Boer, white South African of Dutch or Huguenot descent.. A peasant.. A yokel, country bumpkin.. An uncultured person.
boorish (English)
Behaving as a boor; rough in manners.