plural lunacies
1
dated
a
b
: intermittent insanity once believed to be related to phases of the moon
2
: wild foolishness : extravagant folly
3
: a foolish act
Examples of lunacy in a Sentence
Quitting her job was lunacy.
His idea was considered total lunacy.
Recent Examples on the Web
Epstein is a lose-lose situation for Trump Compounding the lunacy, there’s no way for Trump or anyone else to calm the outrage.
—
Bill Goodykoontz, AZCentral.com, 14 July 2025
If this approach never worked in 46 years of Iranian lunacy, that's because it was also never tried.
—Newsweek Staff, MSNBC Newsweek, 25 June 2025
What’s the approach to a scene with that degree of lunacy?
—Joe Reid, Vulture, 18 June 2025
Among the other eight walk-offs, the only one that can match the pure lunacy of Bailey’s was Heliot Ramos’ Little League home run, one that required the Texas Rangers to commit two throwing errors.
—Justice Delos Santos, Mercury News, 9 July 2025
See All Example Sentences for lunacy
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Bill Goodykoontz, AZCentral.com, 14 July 2025
If this approach never worked in 46 years of Iranian lunacy, that's because it was also never tried.
—Newsweek Staff, MSNBC Newsweek, 25 June 2025
What’s the approach to a scene with that degree of lunacy?
—Joe Reid, Vulture, 18 June 2025
Among the other eight walk-offs, the only one that can match the pure lunacy of Bailey’s was Heliot Ramos’ Little League home run, one that required the Texas Rangers to commit two throwing errors.
—Justice Delos Santos, Mercury News, 9 July 2025
See All Example Sentences for lunacy
Cite this Entry
“Lunacy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lunacy. Accessed 6 Aug. 2025.
Copy CitationKids Definition
Medical Definition
lunacy
noun
lu·na·cy
ˈlü-nə-sē 
plural lunacies
dated
: mental illness
also
: intermittent mental illness once believed to be related to phases of the moon
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