Meaning of “lunacy” in the English Dictionary

british dictionary

(Definition of “lunacy” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"lunacy" in American English

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lunacynoun [ U ]

us /ˈlu·nə·si/

extreme foolishness or mental illness:

It would be lunacy to try and climb the mountain in this weather.

(Definition of “lunacy” from the Cambridge Academic Content Dictionary © Cambridge University Press)