Definitions:
" of a thing: characteristic of the countryside or country life; of a type or style appropriate to the country; especially plain, simple; crude.

of speech, writing, behaviour, etc.: characteristic or typical of country people; especially (depreciative) unrefined, vulgar.

of a person: boorish; unsophisticated; = ""rustic"".

a person who lives in the countryside (typically implying ignorance or lack of sophistication); a yokel; = ""rustic"".

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