Here are some ways to think about "preposterous":
* Beyond reason: It suggests something that goes against all common sense and logic.
* Outlandish: It's something so strange or unbelievable that it seems impossible.
* Unbelievable: It describes something so absurd that you can't believe it could actually happen.
Here are some examples:
* "The idea that the Earth is flat is preposterous." (This statement is clearly illogical and contradicts scientific evidence.)
* "It's preposterous to think that you can fly to the moon on a broom." (This statement is absurd and fantastical.)
* "The plan to build a giant ice sculpture in the desert is preposterous." (This idea is impractical and nonsensical.)
Essentially, "preposterous" is a word that describes something that is so far removed from reality or reason that it's almost laughable.