Webster's English Dictionary

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mad

1. mad \'mad\ aj or mad.der;  or mad.dest [ME medd, madd, fr. OE 
   gem-d, pp. of (assumed) Xgem-dan to madden, fr. gema-d silly, 
   mad; akin to OHG gimeit foolish, crazy, Skt methati he hurts 1: disordered 
   in mind : INSANE  2a: completely unrestrained by reason and judgment : 
   SENSELESS  2b: incapable of being explained or accounted for : ILLOGICAL  
   3a: carried away by intense anger : FURIOUS  3b: keenly displeased : ANGRY  
   4: carried away by enthusiasm or desire  5: affected with rabies : RABID  
   6: marked by wild gaiety and merriment : HILARIOUS  7: intensely excited : 
   DISTRAUGHT, FRANTIC  8: marked by intense and often chaotic activity : WILD 
2. mad vb or mad.ded;  or mad.ding : MADDEN 
3. mad n 1: ANGER, FURY  2: a fit or mood of bad temper