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go mad


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WordReference Random House Learner's Dictionary of American English © 2026
mad /mæd/USA pronunciation   adj., mad•der, mad•dest. 
  1. Psychiatrymentally disturbed or mentally ill;
    deranged.
  2. angry;
    greatly irritated;
    enraged:[be + ~]He's really mad at his daughter.
  3. affected with rabies;
    rabid:a mad dog.
  4. extremely foolish:a mad scheme.[be + ~ + to + verb]You're mad to go out in such weather.
  5. very hurried and disorganized:[before a noun]mad haste.
  6. full of enthusiasm;
    infatuated:[be + ~]He's mad about opera.
  7. wildly fun-loving;
    hilarious:[before a noun]a mad time at the party.
Idioms
  1. drive someone mad, to cause someone to be furious or irritated:Rush hour traffic always drives her mad.
  2. like mad, at a furious pace:rushing around like mad.

mad•ly, adv. : madly in love with her.
mad•ness, n. [uncountable]suffering from madness.

WordReference Random House Unabridged Dictionary of American English © 2026
mad  (mad),USA pronunciation adj., mad•der, mad•dest, n., v., mad•ded, mad•ding. 
adj. 
  1. Psychiatrymentally disturbed;
    deranged;
    insane;
    demented.
  2. enraged;
    greatly provoked or irritated;
    angry.
  3. (of animals)
    • abnormally furious;
      ferocious:a mad bull.
    • affected with rabies;
      rabid:a mad dog.
  4. extremely foolish or unwise;
    imprudent;
    irrational:a mad scheme to invade France.
  5. wildly excited or confused: frantic:mad haste.
  6. overcome by desire, eagerness, enthusiasm, etc.;
    excessively or uncontrollably fond;
    infatuated:He's mad about the opera.
  7. wildly gay or merry;
    enjoyably hilarious:to have a mad time at the Mardi Gras.
  8. (of wind, storms, etc.) furious in violence:A mad gale swept across the channel.
  9. Idioms, Informal Terms like mad, [Informal.]with great haste, impulsiveness, energy, or enthusiasm:She ran like mad to catch the bus.
  10. Idioms mad as a hatter, completely insane.

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

v.t. 
  1. [Archaic.]to make mad.

v.i. 
  1. [Archaic.]to be, become, or act mad.
  • bef. 900; Middle English mad (adjective, adjectival), madden (intrans. verb, verbal, derivative of the adjective, adjectival); 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
    • 1.See corresponding entry in Unabridged lunatic, maniacal, crazed, crazy.
    • 2.See corresponding entry in Unabridged furious, exasperated, raging, wrathful, irate.
    • 4.See corresponding entry in Unabridged 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.See corresponding entry in Unabridged frenzied.
    • 4.See corresponding entry in Unabridged sensible, practical; sound, safe.
    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.
MAD  (mad),USA pronunciation n. 
  1. Military, GovernmentSee Mutual Assured Destruction. 

mad., 
  1. madam.

Collins Concise English Dictionary © HarperCollins Publishers::
mad / mæd/ (madder, maddest)
  1. severely mentally ill, so that normal thinking and behaviour is impossible
  2. senseless; foolish: a mad idea
  3. (often followed by at) angry; resentful
  4. followed by about, on, or over; often postpositive: wildly enthusiastic (about) or fond (of): mad about football, football-mad
  5. extremely excited or confused; frantic: a mad rush
  6. temporarily overpowered by violent reactions, emotions, etc: mad with grief
  7. (of animals) unusually ferocious: a mad buffalo
  8. afflicted with rabies
  9. like mad ⇒ with great energy, enthusiasm, or haste; wildly
  10. mad as a hatter ⇒ crazily eccentric
 (mads, madding, madded)
  1. to make or become mad; act or cause to act as if mad
Etymology: 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
'go mad' also found in these entries (note: many are not synonyms or translations):
craze - go - top

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