Pronunciation: (mad), [key]
—adj., mad•der, mad•dest,
—n., v., mad•ded, mad•ding.
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.
an angry or ill-tempered period, mood, or spell: The last time he had a mad on, it lasted for days.
Archaic.to make mad.
Archaic.to be, become, or act mad.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.