mad
adjective
mentally disturbed; deranged; insane; demented.
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mad
1 American
[mad]
/ mæd /
adjective
-
madder,
comparative
-
maddest
superlative
-
mentally disturbed; deranged; insane; demented.
-
enraged; greatly provoked or irritated; angry.
-
(of animals)
-
abnormally furious; ferocious.
a mad bull.
-
affected with rabies; rabid.
a mad dog.
-
-
extremely foolish or unwise; imprudent; irrational.
a mad scheme to invade France.
- Synonyms:
- perilous, dangerous, unsafe, ill-advised
-
wildly excited or confused; frantic.
mad haste.
- Synonyms:
- frenzied
-
overcome by desire, eagerness, enthusiasm, etc.; excessively or uncontrollably fond; infatuated.
He's mad about the opera.
-
wildly lively and merry; enjoyably hilarious.
to have a mad time at the Mardi Gras.
-
(of wind, storms, etc.) furious in violence.
A mad gale swept across the channel.
-
Slang. much or many.
Mad props for getting this organization off the ground.
adverb
verb (used with object)
madded,
madding
verb (used without object)
madded,
madding
idioms
-
like mad, with great haste, impulsiveness, energy, or enthusiasm.
She ran like mad to catch the bus.
-
have a mad on, to be angry for a period of time; be in a bad mood.
The last time he had a mad on, it lasted for days.
-
mad as a hatter, completely insane.
MAD
2
American
[mad]
/ mæd /
noun
mad.
3
American
abbreviation
mad
1
British
/ mæd /
adjective
-
mentally deranged; insane
-
senseless; foolish
a mad idea
-
informal (often foll by at) angry; resentful
-
wildly enthusiastic (about) or fond (of)
mad about football
football-mad
-
extremely excited or confused; frantic
a mad rush
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temporarily overpowered by violent reactions, emotions, etc
mad with grief
-
-
unusually ferocious
a mad buffalo
-
afflicted with rabies
-
-
informal with great energy, enthusiasm, or haste; wildly
-
crazily eccentric
verb
MAD
2
British
/ mæd /
acronym
mad
More Idioms
Usage
Mad meaning “enraged, angry” has been used since 1400, and this sense is a very common one. Because some teachers and usage critics insist that the only correct meaning of mad is “mentally disturbed, insane,” mad is often replaced by angry in formal contexts: The president is angry at Congress for overriding his veto.
Synonym Usage
Mad, crazy, insane are used to characterize wildly impractical or foolish ideas, actions, etc. Mad suggests senselessness and excess: The scheme of buying the bridge was absolutely mad. In informal usage, crazy suggests recklessness and impracticality: a crazy young couple. Insane is used with some opprobrium to express unsoundness and possible harmfulness: The new traffic system is simply insane.
Other Word Forms
Derived Forms
-
half-madnessnoun
-
half-madadjective
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maddishadjective
-
quasi-madadjective
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unmadadjective
-
unmaddedadjective
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half-madlyadverb
-
quasi-madlyadverb
Inflected Forms
Adjectives
Etymology
Origin of mad
First recorded before 900; Middle English mad (adjective), madden (intransitive verb, derivative of the adjective); Old English gemǣd “made mad,” past participle of gemǣdan (unrecorded) “to make mad,” akin to gemād “mad, foolish”; cognate with Old Saxon gemēd, Old High German gimeit “foolish”
Explanation
If you're mad about something, you've lost your temper. If you've gone mad, you've lost your mind. Just like it's more common to be angry than to be insane, you're more likely to use mad to describe someone who's ticked off than to describe someone who has serious mental problems. If you say you're “mad about” something, you're saying you like it so much it distracts you.
Vocabulary lists containing mad
In the Mood? 100 Words to Describe Emotions
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Hooked on a Feeling, List 1
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
"The Tell-Tale Heart" and "The Raven"
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
See Examples For:
And if you zoom out just a little bit, you see this same disturbing inequality through a much bigger lens—and people are finally getting mad about it.
From Slate ● Nov. 3, 2026
It’s taken a long, mad sprint to get this close.
From Los Angeles Times ● Oct. 31, 2026
He also draws on his own experience of epilepsy to explore the fear of mental disintegration, having written to his doctor in 1867 that he was “afraid of going mad or falling into idiocy.”
From The Wall Street Journal ● Oct. 30, 2026
Let’s assume that if you’re reading this far, you already know the first movie’s big twist: the real killer wasn’t Jason Voorhees, but his mad mama.
From Salon ● Oct. 18, 2026
Oh, there was once a dog named Fonzie who nearly took his head off, but Fonzie wasn’t really mad at him so much as surprised.
From "Woodsong" by Gary Paulsen
Designed by Ma Yansong of MAD architects, it opens on Sept. 22.
From The Wall Street Journal ● Sep. 16, 2026
The $1 billion, 300,000-square-foot museum was designed by MAD Architects founder Ma Yansong.
From Los Angeles Times ● Nov. 12, 2025
Talking to MAD winner, Kevin Willows, who helped set up a bereavement walking group, Grennan revealed the importance of walking to him.
From BBC ● Apr. 21, 2025
David Zucker: Not only that, we had some outside influences, like "MAD Magazine," that was a textbook for us.
From Salon ● Oct. 3, 2023
This reminded Jonah of a spoof he’d seen once in MAD magazine that was supposed to teach kids how to lie convincingly.
From "Found" by Margaret Peterson Haddix
“I’m mad. To take from these men who are working so hard for me, who’ve tried to accumulate all these tools. ... My heart felt so heavy.”
From Los Angeles Times ● Oct. 27, 2026
“That’s when I got mad. Like, ‘Oh, my God.
From The Wall Street Journal ● Jul. 23, 2026
“It infuriates her. It doesn’t make me mad. I feel very fortunate that I can make time during the day and do these things.”
From MarketWatch ● Jun. 23, 2026
"It's pretty mad. You can't put a price on it," Laurent Saget, who runs Terres Blanches, told AFP.
From Barron's ● Jan. 6, 2026
"Hey, hey, don't get mad. I'm just saying."
From "When I Was the Greatest" by Jason Reynolds
"I'm mad about the price, but I'm even madder about why it's so high," the 28-year-old told AFP.
From Barron's ● May 2, 2026
You can't be any madder at us than I am...
From BBC ● Nov. 27, 2025
“The more I looked at it, the madder I got,” he recalled.
From Seattle Times ● Apr. 19, 2024
Depending on how things go, the situation might get even madder.
From Los Angeles Times ● Mar. 17, 2024
Cully lost the vertical stripes of his first year’s plumage and became greyer, grimmer, madder, and distinguished by smart horizontal ban where the long stripes had been.
From "The Once and Future King" by T. H. White
It was the maddest the sport had gotten in ages at anything that didn’t involve Lane Kiffin.
From The Wall Street Journal ● Sep. 6, 2026
In one of the maddest storylines of March, Monson’s team did not go quietly in what was supposed to be his final week on the job.
From Los Angeles Times ● Mar. 17, 2024
In this maddest of Marches, it’s the first time since seeding began in 1979 that no team seeded better than No. 4 made the Final Four.
From Washington Times ● Mar. 26, 2023
An upside of the upsets: perhaps the maddest March ever.
From Seattle Times ● Mar. 20, 2023
Josie couldn’t even tell which specific scene he was talking about, or which awful thing one of them had done to the other she felt maddest or guiltiest about.
From "The School for Whatnots" by Margaret Peterson Haddix
But Claudia's nonsense madded me, though her speech had been no broader than was fashionable among a gentry so closely in touch with London, where speech, and manners, too, were broader still.
From The Little Red Foot by Robert W. (Robert William) Chambers
For Mrs. Bleecker was very wrathful, Euan, and Lana's indiscretions madded her....
From The Hidden Children by Robert W. (Robert William) Chambers
Well, I was going on to get off a few more things I'd got madded up to, but I caught the look in poor Hetty's face, and it would have melted a stone.
From Somewhere in Red Gap by Harry Leon Wilson
Take such a phrase as "the madded land"; there, indeed, is a word coined by the noble rage as the last century evoked it.
From Flower of the Mind by Alice Christiana Thompson Meynell
Had I but seene thy picture in this plight, It would haue madded me.
From Titus Andronicus by William Shakespeare
Clustered barnacle-like at the end of a glorious arc of sand, Beadnell, along with the neighbouring villages of Bamburgh and Seahouses, has long been a magnet for those seeking refuge from the madding crowd.
From BBC ● Feb. 25, 2026
Far from the madding crowd, not to mention from the alluring presence of his MI6 handler and former lover, Faith Green, Gabriel works away in his cottage on a travel book about the world’s rivers.
From The Wall Street Journal ● Nov. 12, 2025
This is a crowded sports market, even with the Sonics gone for a decade and a half, and standing out from the madding crowd isn’t easy.
From Seattle Times ● May 5, 2023
If you really want to avoid the madding crowds go offseason.
From New York Times ● Jun. 12, 2019
It was exactly the madding crowd that Bobby wished would stay afar.
From "Endgame" by Frank Brady
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Get a wordDefinitions 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.
