1
as in insanity
a foolish act or idea
you want to sneak into the building after the alarm is set—what lunacy!
Synonyms & Similar Words
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Antonyms & Near Antonyms
2
as in dementia
a serious mental disorder that prevents one from living a safe and normal life
the judge ruled that the lunacy of the accused made him incompetent to stand trial
Synonyms & Similar Words
Antonyms & Near Antonyms
3
as in madness
lack of good sense or judgment
was it desperation or lunacy that caused him to quit his job and move to California without any plan for what to do when he got there?
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Antonyms & Near Antonyms
Example Sentences
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Recent Examples of lunacy
Once upon a time, the idea of a baseball team allowing most of its games to be broadcast on television was lunacy.
—
Ken Sugiura,
AJC.com,
24 Feb. 2026
Because it’s invariably attached to the idea of some kind of lunacy.
—
Zack Sharf,
Variety,
3 Nov. 2025
Because it's invariably attached to the idea of some kind of lunacy.
—
Mekishana Pierre,
Entertainment Weekly,
3 Nov. 2025
Yang is genius not just for playing the easy pickins of George Santos but high-concept lunacy like a gay oompaloompa and the iceberg that sunk the Titanic.
—
Steven Zeitch,
HollywoodReporter,
20 Aug. 2025
See All Example Sentences for lunacy
Ken Sugiura,
AJC.com,
24 Feb. 2026
Because it’s invariably attached to the idea of some kind of lunacy.
—
Zack Sharf,
Variety,
3 Nov. 2025
Because it's invariably attached to the idea of some kind of lunacy.
—
Mekishana Pierre,
Entertainment Weekly,
3 Nov. 2025
Yang is genius not just for playing the easy pickins of George Santos but high-concept lunacy like a gay oompaloompa and the iceberg that sunk the Titanic.
—
Steven Zeitch,
HollywoodReporter,
20 Aug. 2025
See All Example Sentences for lunacy
Recent Examples of Synonyms for lunacy
Noun
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Bland was obsessed with religion, but that did not amount to insanity, the prosecutor argued.
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Part of what drew him to the case, Burton said, was that many of the issues relevant then are still relevant today, like the death penalty, the use of the insanity defense, parole and rehabilitation.
Noun
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Omega-3 polyunsaturated fatty acids have been shown to lower blood pressure, boost good cholesterol, maintain cell health, and reduce the risk for cancer, dementia, and Alzheimer's disease.
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Those who need it can also get behavioral health and dementia care.
Noun
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Is this just a salary dump, or is there a method to the madness for the Wolves?
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Welcome to the Amazon Prime Day 2026 madness!
Noun
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That’s the level of idiocy in the Los Angeles city government.
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The idiocy of these people knows no bounds.
Noun
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It was judged to be some sort of mass hysteria.
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The virtual hysteria over the muskrat invasion resulted in Britain’s first legislation to target a non-native invasive species.
Noun
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And yet the absurdity didn’t stop there.
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At a time when the average new vehicle transaction price continues marching toward absurdity (roughly $51,000 now), that affordability matters.
Noun
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Light and Breezy One of the many virtues of the ’60s shift is its simplicity.
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The collection expressed an idea of contemporary simplicity, built through precise proportions, evolved materials and a new visual lightness.
Noun
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The forecast for Thursday calls for craziness.
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Meanwhile, the Spurs had to rush off the court to avoid getting caught up in all the craziness.
Cite this Entry
“Lunacy.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/lunacy. Accessed 29 Jun. 2026.
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