1The company's claim that their new product would revolutionize the industry was, frankly, ludicrously optimistic.
2Was it ludicrously expensive to install solar panels on every house in the neighborhood?
3She argued that the government's decision to cut funding for the arts was ludicrously short-sighted.
4Do not invest in the stock market if you think you can make ludicrously high returns without any risk.
5The idea that we can solve climate change by simply planting more trees is ludicrously simplistic.