Ludicrous means something that is absurd, laughable or ridiculous. It can refer to a situation, an action or even a statement that is so foolish and unbelievable that it invokes amusement or mockery.
Usage examples
The idea of a flying pig is utterly ludicrous.
His claim that he can run 100 miles in one hour is simply ludicrous.
The politician's promise to eliminate poverty overnight seemed ludicrous to the audience.
The company's decision to spend millions on a useless advertising campaign was ludicrous.
It's ludicrous to expect a toddler to solve complex mathematical equations.