What does CDD mean for Slang Dictionary

adjective, comparativemad · der [mad-er], / ˈmæd ər /, superlativemad · dest [mad-ist]. / ˈMæd ɪst /.

mentally disturbed; deranged; insane; demented.
enraged; greatly provoked or irritated; angry.
(of animals)
  1. abnormally furious; ferocious: a mad bull.
  2. affected with rabies; rabid: a mad dog.
extremely foolish or unwise; imprudent; irrational: a mad scheme to invade France.
wildly excited or confused; frantic: mad haste.
overcome by desire, eagerness, enthusiasm, etc .; excessively or uncontrollably fund; 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.


an angry or ill-tempered period, mood, or spell: The last time he had a mad on, it lasted for days.

verb (used with object), mad ded, mad ding.

verb (used without object), mad ded, mad ding.

Archaic. to be, become, or act mad.


WATCH NOW: How Does The Word "Mad" Have So Many Meanings?

The word "mad" really drives me mad. I mean, just think about it. I'm so mad at you, I could say. But what if I said I'm so mad about you. Those are like two opposite things, infuriation and infatuation. How can this one word, "mad," be both?




Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Idioms for mad

    like mad, informal. with great haste, impulsiveness, energy, or enthusiasm: She ran like mad to catch the bus.
    mad as a hatter, completely insane.

Origin of mad

First recorded before 900; Middle English mad (adjective), madden (intransitive verb, derivative of the adjective); Old English gemǣd, past participle of gemǣdan (unattested) “to make mad,” akin to gemād “mad, foolish”; cognate with Old Saxon gemēd, Old High German gimeit “foolish”

synonym study for mad

4. 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.

usage note for mad

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.

historical usage of mad

The history of mad is complicated both in form and in meaning. In form mad goes back to Old English gemǣd “troubled in mind, demented,” the past participle of an unrecorded verb gemǣdan “to madden, make foolish,” a derivative of the adjective gemād (also mād) “unreasoning, foolish, mad. ”
The Old English forms are from the Germanic adjective gamaidaz "changed for the worse, abnormal." The element maid- in gamaidaz is from Proto-Indo-European moi-, a variant of the root mei-, moi- “to change, exchange, go, move,” extended with a dental suffix (-d in Germanic, -t elsewhere). The same suffixed variant moit- appears in Latin mūtāre "to change, exchange, give and receive in exchange." Sicilian Greek (therefore likely to be influenced by Latin) has the noun moîtos “thanks, favor, reward,” which is possibly a borrowing from Old Latin moitus.
The progression of senses of mad starts with its original sense in Old English, "troubled in mind, demented." The senses “rabid (dog),” “foolish or unwise,” and “overcome by desire or eagerness” are all recorded from around 1300. Mad in the sense “enraged, angry” arose after about 1400. This sense of mad is the Usual colloquial term in the United States (the British are more likely to use angry) and has been condemned by the arbiters of usage since the late 18th century. The sense “wildly lively, merry” is an Americanism, associated with jazz and African Americans, and dates to the early 1940s.
like mad (initially, for mad) is quite old, from the 14th century. We take it today to mean "with great haste or energy," but the original meaning was more literal: "in the manner of one who is mad."


half-mad, adjectivehalf-madly, adverbhalf-madness, nounquasi-mad, adjective
quasi-madly, adverbun mad, adjectiveun mad ded, adjective

Words nearby mad

maculopapule, maculopathy, macumba, macushla, Macy, mad, mad about, madafu, Madag., Madagascan, Madagascar

Definition for mad (2 of 3)

Definition for mad (3 of 3)

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

Words related to mad

fantastic, frenzied, delirious, kooky, nutty, demented, frantic, absurd, foolish, psychotic, resentful, livid, agitated, furious, distraught, excited, exasperated, crazy, nuts, aberrant

Example sentences from the Web for mad

  • When he has called the police in the past, they have not responded, or responded "mad late."

  • From righteous fury to faux indignation, everything we got mad about in 2014 — and how outrage has taken over our lives.

  • The house decays around Amelia and Samuel, their world narrows and becomes mad, undealable with.

  • We fight over their ownership and control, as if reality were a resource as scarce as the water and oil in Mad Max.

British Dictionary definitions for mad (1 of 2)


mentally deranged; insane
senseless; foolisha mad idea
(often foll by at) informalangry; resentful
(foll by about, on, or over; often postpositive) wildly enthusiastic (about) or fond (of) mad about football; football-mad
extremely excited or confused; frantica mad rush
temporarily overpowered by violent reactions, emotions, etcmad with grief
(of animals)
  1. unusually ferociousa mad buffalo
  2. afflicted with rabies
like madinformal with great energy, enthusiasm, or haste; wildly
mad as a hattercrazily eccentric

verbmads, maddingormadded

archaicto make or become mad; act or cause to act as if mad

Derived forms of mad

maddish, adjective

Word Origin for mad

Old English gemǣded, past participle of gemǣdan to render insane; related to gemād insane, and to Old High German gimeit silly, crazy, Old Norse meitha to hurt, damage

British Dictionary definitions for mad (2 of 2)

n acronym forUS

mutual assured destruction: a theory of nuclear deterrence whereby each side in a conflict has the capacity to destroy the other in retaliation for a nuclear attack
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for mad


Suffering from a disorder of the mind; insane.
Affected by rabies; rabid.
The American Heritage® Stedman's Medical Dictionary Copyright й 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Idioms and Phrases with mad

In addition to the idioms beginning with mad

  • mad about
  • mad as a hatter
  • mad as a hornet
  • made for each other
  • made of money
  • made to measure
  • made to order
  • mad rush

also see:

  • crazy (mad) about
  • drive someone crazy (mad)
  • hopping mad
  • like crazy (mad)
  • heavily raving mad
The American Heritage® Idioms Dictionary Copyright й 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.