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The phrase "a preposterous idea" is correct and usable in written English.
It can be used to describe an idea that is absurd or ridiculous, often in a critical context.
Example: "The proposal to build a theme park in the middle of the desert seemed like a preposterous idea to the committee."
Alternatives: "an absurd notion" or "a ridiculous concept".
Exact(18)
A preposterous idea?
That's a preposterous idea.
It was a preposterous idea.
That would have been a preposterous idea 20 years ago.
It was a preposterous idea that, playing along with a twinkle, he did nothing to disabuse.
"I e-mailed them and tried not to sound insane — I mean, it's such a preposterous idea".
Similar(42)
I envisioned myself writing again, and it didn't seem like a totally preposterous idea.
For many people, the notion that the purpose of a firm is something other than making money is still a strange, even preposterous, idea.
It is a delicious and preposterous idea - but it underscores how the fizzily charming Boaden likes to play a hands-on role in her station's programming.
As a piece of theatre, it's perfect, brilliantly edited and satisfyingly complete, but it's predicated on a single ugly truth: the preposterous idea that a homely, middle-aged woman could possibly have talent.
Speaking of this preposterous idea that a woman needs a man: Who thought this horribly sexist Batman T-shirt was a good idea?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com