* "The idea that we could travel to Mars in a week is absolutely ludicrous." (This sentence uses "ludicrous" to express something that is completely absurd and unreasonable.)
* "His claim that he could fly was met with laughter and cries of 'ludicrous!'" (This sentence uses "ludicrous" to describe a claim that is obviously false and ridiculous.)
* "The company's attempt to market a product that clearly didn't work was a ludicrous marketing strategy." (This sentence uses "ludicrous" to describe an action that is illogical and likely to fail.)
* "The amount of money they spent on their wedding was ludicrous." (This sentence uses "ludicrous" to describe something that is excessive and out of proportion.)
* "The government's response to the crisis was ludicrously slow and ineffective." (This sentence uses "ludicrously" as an adverb to emphasize the extreme absurdity of the situation.)
Remember that "ludicrous" carries a strong negative connotation, implying something is utterly ridiculous or nonsensical.