Idioms

    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

before 900; Middle English mad (adj.), madden (intransitive v., derivative of the adj.); Old English gemǣd(e)d, past participle of *gemǣdan to make mad, akin to gemād mad, foolish; cognate with Old Saxon gemēd, Old High German gimeit foolish
SYNONYMS FOR mad
2 furious, exasperated, raging, wrathful, irate.
4 ill-advised; unsafe, dangerous, perilous. 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.
5 frenzied.
Related forms

Usage note

Mad meaning “enraged, angry” has been used since 1300, 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.

Definition for mad (2 of 3)

MAD

[ mad ]
/ mæd /

noun

Definition for mad (3 of 3)

mad.


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for mad

British Dictionary definitions for mad (1 of 2)

mad

/ (mæd) /

adjective madder or maddest

verb mads, madding or madded

archaic to make or become mad; act or cause to act as if mad
Derived Formsmaddish, 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)

MAD

/ (mæd) /

n acronym for US

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

Medicine definitions for mad

mad

[ măd ]

adj.

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

Idioms and Phrases with mad

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)
  • stark raving mad
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.