lunacy

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The word lunacy, meaning "madness, " is derived from Luna, the Latin name for the Roman goddess of the moon.
“lunacy”这个表示“疯狂”的词源自“Luna ”一罗马神话中月光女神的拉丁名。
My poor friend Andrei Bumblowski, formerly Professor of Philosophy in a now extinct university of Central Europe, appeared to me to suffer from a harmless kind of lunacy.
我可怜的朋友安德烈．巴姆布朗斯基，一位伦敦中部一所现已废弃的大学的前教授，在我看来患上了一种无实质性损害的精神错乱。
Critics deride the scheme as economic lunacy and a boon for construction companies such as the one Mr Lee used to run, Hyundai Construction.
批评家嘲笑他的计划，例如经济上的疯狂和对如同他曾经经营过的现代建设公司那样的建筑公司的福利。

Almost one thousand seven hundred high school teams entered a level of competition called LUNACY.
The teams had six weeks to build robots that could compete in the LUNACY game.
An alliance of teams from California, Illinois and Michigan won the LUNACY competition.

Their idea of putting U.S. forces in the middle of this conflict is sheer lunacy.
CENTERFORSECURITYPOLICY: Return to Mideast First Principles

If you describe someone's behaviour as lunacy, you mean that it seems very strange or foolish.
Lunacy is severe mental illness.