madness
Americannoun
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the state of being mad; insanity.
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senseless folly.
It is sheer madness to speak as you do.
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frenzy; rage.
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intense excitement or enthusiasm.
noun
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insanity; lunacy
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extreme anger, excitement, or foolishness
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a nontechnical word for rabies
Other Word Forms
Etymology
Origin of madness
First recorded in 1350–1400, madness is from the Middle English word madnesse. See mad, -ness
Explanation
Madness is foolish, impulsive behavior. It would be madness to ride on the back of your friend's car, standing on the bumper. A screaming crowd waiting to see their favorite rock star creates an atmosphere of madness — and their enthusiasm itself can be described as madness. You could also say that donating all your money to an animal shelter would be madness, or describe the madness of a busy Thanksgiving Day sale. Madness sometimes takes on its original meaning, "mental instability" or "insanity."
Vocabulary lists containing madness
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.
The company highlighted particularly strong engagement with Spotlight posts, its vertical video feature, and a group chat focused on March Madness.
From The Wall Street Journal • May 6, 2026
Even teams with conference records under .500 are usually considered more desirable additions to March Madness than mid-major potential Cinderellas.
From Los Angeles Times • Apr. 29, 2026
A $150 March Madness ticket would not, likely, be of real material benefit to either of you.
From MarketWatch • Apr. 7, 2026
By 2023, May was no longer content just winning a game or two at March Madness.
From The Wall Street Journal • Apr. 5, 2026
We became curious about the real Children’s Crusade, so O’Hare looked it up in a book he had, Extraordinary Popular Delusions and the Madness of Crowds, by Charles Mackay, LL.
From "Slaughterhouse-Five" by Kurt Vonnegut
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.
