maniac
Americannoun
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a raving or violently insane person; lunatic.
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any intemperate or overly zealous or enthusiastic person.
a maniac when it comes to details.
adjective
noun
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a wild disorderly person
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a person who has a great craving or enthusiasm for something
a football maniac
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obsolete psychiatry a person afflicted with mania
Other Word Forms
Noun Inflected Forms
Etymology
Origin of maniac
First recorded in 1595–1605, maniac is from the Medieval Latin word maniacus of, pertaining to madness. See mania, -ac
Explanation
A maniac is a crazy person. Screaming like a maniac is never a good way to get your point across. Long ago, the word maniac was an official psychiatric term that meant "a patient suffering from mania," or manic disorder, involving a euphoric mood and extreme energy. Maniac isn't used in a clinical way anymore, but only informally to mean "lunatic." You might describe yourself running around the house like a maniac looking for your car keys, or dismiss your sports-obsessed brother as "a football maniac." The Greek root is mania, or "madness."
Vocabulary lists containing maniac
It's Madness!: Mania
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The Hot Zone
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The 15 Most Relevant Words from the Fifth Republican Presidential Debate (+5 more words of note)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Walking and typing is dangerous, but walking and talking like a maniac into my own recorder is merely antisocial.
From Slate • May 24, 2026
Bardem already proved with his Oscar-winning portrayal of the stun-gun-toting maniac in “No Country for Old Men” that he has a mesmerizing power in playing sinister characters.
From Los Angeles Times • May 13, 2026
I was expecting Rob Lowe to be some maniac.
From Salon • Aug. 22, 2024
“And I’m not some crazed maniac set out to destroy this nation.”
From Seattle Times • Oct. 6, 2023
He is not a maniac anymore; he is perfectly controlled, perfectly poised.
From "Divergent" by Veronica Roth
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
