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
Why do so many leaders turn a blind eye to this lunacy?
—
Letters To The Editor, Oc Register, 29 May 2025
Hart would throw one more strike in four more pitches, and his day was finished, as the lunacy was just getting started.
—Kevin Acee, San Diego Union-Tribune, 6 Apr. 2025
There’s a mixture of artful lunacy that smacks like experimental IDM (Insane Dance Music)—especially by people with a background in electronic sound design like selasi—and irredeemable blather.
—Kieran Press-Reynolds, Pitchfork, 4 June 2025
Like the series as a whole, the finale walked the line between lunacy and poignancy, ultimately leaving its dysfunctional evangelists in a place of peace and resolution without sacrificing the outrageous laughs for which the series has become known.
—Jim Hemphill, IndieWire, 5 May 2025
See All Example Sentences for lunacy
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Letters To The Editor, Oc Register, 29 May 2025
Hart would throw one more strike in four more pitches, and his day was finished, as the lunacy was just getting started.
—Kevin Acee, San Diego Union-Tribune, 6 Apr. 2025
There’s a mixture of artful lunacy that smacks like experimental IDM (Insane Dance Music)—especially by people with a background in electronic sound design like selasi—and irredeemable blather.
—Kieran Press-Reynolds, Pitchfork, 4 June 2025
Like the series as a whole, the finale walked the line between lunacy and poignancy, ultimately leaving its dysfunctional evangelists in a place of peace and resolution without sacrificing the outrageous laughs for which the series has become known.
—Jim Hemphill, IndieWire, 5 May 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 14 Jul. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share