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adj.1. mentally disturbed; deranged; insane; demented.2. enraged; greatly provoked or irritated; angry.3. (of animals)a. abnormally furious; ferocious: a mad bull.b. 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. like mad, Informal. with great haste, impulsiveness, energy, or enthusiasm: She ran like mad to catch the bus.10. mad as a hatter, completely insane.n.11. an angry or ill-tempered period, mood, or spell: The last time he had a mad on, it lasted for days.v.t.12. Archaic. to make mad.v.i.13. Archaic. to be, become, or act mad.[bef. 900; ME mad (adj.), madden (intrans. v., deriv. of the adj.); OE gemaed(e)d, ptp. of *gemaedan to make mad, akin to gemad mad, foolish; c. OS gemed, OHG gimeit foolish]Syn. 1. lunatic, maniacal, crazed, crazy. 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.Ant. 4. sensible, practical; sound, safe.Usage. 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.
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(as used in expressions)Charles the MadMad King Ludwig* * *
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