mad

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Concise Oxford English Dictionary © 2008 Oxford University Press:
mad/mad/
adjective (madder, maddest)
  • 1 mentally ill; insane.

    ■ extremely foolish or ill-advised.

    ■ (of a dog) rabid.

  • 2 informal frenzied; frantic.
  • 3 informal very enthusiastic about something. [in combination] he's football-mad.
  • 4 informal very angry.
verb (mads, madding, madded) archaic make mad.
– phrases
like mad informal with great intensity, energy, or enthusiasm.
mad keen Brit. informal very enthusiastic.
– derivatives
madly adverb,
madness noun.
– origin OE gemǣd(e)d ‘maddened’, participial form rel. to gemād ‘mad’, of Gmc origin.
'mad' also found in these Oxford entries:

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