noun
a person who speaks at length in a pompous or boastful manner
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The panel discussion was disrupted by the bloviator who dominated the conversation with his long-winded speeches.
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I can't stand that bloviator at work who never stops talking about himself.
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The bloviator at the party wouldn't shut up about his new car.
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Her writing style is often criticized as bloviating, with excessive words that don't add substance.