noun
a person who is vulgar or lacks good taste in manners or behavior
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The socialite was appalled by the behavior of the vulgarian at the charity gala.
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I can't believe that vulgarian's rude comments at the dinner party.
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That guy is such a vulgarian, always making inappropriate jokes.
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His taste in art was that of a vulgarian, preferring flashy and gaudy pieces over more refined works.