The theory that Stonehenge was constructed by alien life-forms is utterly preposterous.
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It is preposterous to pay a thousand dollars for a five dollar meal.
Preposterous means absurd, incongruous, out of the question, highly unlikely, amazing, incredible, dubious, or simply ridiculous.
Laughable = Pathetic, Pitiful, Absurd, Preposterous, Ludicrous, Mediocre, Rdiculous
a sentence using the word endotracheal
Silly, absurd, preposterous...