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
Synonyms
Examples of lunacy in a Sentence
Quitting her job was lunacy.
His idea was considered total lunacy.
Recent Examples on the Web
There’s always been pushback against anti-immigrant lunacy here.
—
Gustavo Arellano, Los Angeles Times, 30 Jan. 2025
To suggest that anyone who vaccinates their kids doesn’t love them is a whole new level of lunacy.
—Dr. Sanjay Gupta, CNN, 29 Jan. 2025
At its peak, it’s got some adrenalin-pumping lunacy that’s admirable.
—Brian Tallerico, Vulture, 10 Dec. 2024
The sheer quantity of extremist marketing lunacy churned out by Old State Saloon in Eagle is astonishing.
—Michael Deeds, Idaho Statesman, 10 Jan. 2025
See all Example Sentences for lunacy 
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Gustavo Arellano, Los Angeles Times, 30 Jan. 2025
To suggest that anyone who vaccinates their kids doesn’t love them is a whole new level of lunacy.
—Dr. Sanjay Gupta, CNN, 29 Jan. 2025
At its peak, it’s got some adrenalin-pumping lunacy that’s admirable.
—Brian Tallerico, Vulture, 10 Dec. 2024
The sheer quantity of extremist marketing lunacy churned out by Old State Saloon in Eagle is astonishing.
—Michael Deeds, Idaho Statesman, 10 Jan. 2025
See all Example Sentences for lunacy
Dictionary Entries Near lunacy
Cite this Entry
“Lunacy.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lunacy. Accessed 4 Feb. 2025.
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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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