adjective
a term used to describe something that is absurd or ridiculous to a very unreasonable extent
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The idea that aliens built the pyramids is preposterous and lacks any scientific evidence.
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It's preposterous to think that I would lend you money after you never paid me back before.
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That's just straight up preposterous, dude. No way that's true.
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The notion that she could finish the project in one day was preposterous, considering its complexity.