The phrase "it's lunacy" is correct and usable in written English.
You can use it to express that something is irrational, crazy, or nonsensical.
Example: "The idea of running a marathon without any training? It's lunacy!"
Alternatives: "it's madness" or "it's absurd."
Exact(11)
It's lunacy.
It's lunacy, absolute lunacy".
My first thought was: ah, good, the Mail finally agrees it's lunacy we have so few decent bike lanes.
"It's lunacy to talk about cutting an investment," said Randi Weingarten, head of the American Federation of Teachers, "when we know that we need to make sure that educating all kids is as effective and efficient and as great as possible to move all kids to 21st-century learning skills".
"I Am My Own Wife," about the German transvestite Charlotte von Mahlsdorf: I enjoyed it but found myself asking, especially since it moved to Broadway, "Will anybody who is not attuned to gay issues come to this play?" RUDNICK -- It's lunacy to imagine that a play can only speak to your personal experience.
At first blush, it's lunacy – a 900-horsepower, all-electric supercar from an island nation best known for tea and tourism, not tech.
Similar(48)
So they endorse the arguments of drilling proponents, including Alaska's top politicians, who say it is lunacy not to explore the tundra for the billions of barrels of oil that may lie beneath.
In an interview with CNN's Dana Bash, Nunes expressed exasperation with the House' hard-right faction, saying it was "lunacy" to shut down the government in an effort to stop Obamacare.
"It was lunacy," Ms. Apro recalled.
Mr. Ackman, however, thinks it is lunacy — and he's right.
Douglas Gibson, chief whip of the Democratic Alliance, said it was "lunacy" to pick Mr. McBride because he knew nothing about police work.
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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