noun
a person who uses long words
adjective
characterized by long words; long-winded
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The professor's sesquipedalian lecture left the students feeling overwhelmed.
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I can't stand reading his sesquipedalian essays, they're too long and boring.
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Why does he always have to use such sesquipedalian words? It's so annoying.
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Her sesquipedalian storytelling painted a vivid picture in our minds.