noun
a person who talks at length, especially in an opinionated or boastful manner
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The keynote speaker was nothing but a windbag, going on and on without saying anything of substance.
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I can't stand talking to that windbag at the office - he never stops talking about himself.
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Don't listen to that windbag, he's just full of hot air.
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Her words were like a strong gust of wind, blowing away the windbag's arguments.