mad

adjective10

1. •
   (UK) suffering from a serious illness of the mind

   • You want to spend a thousand pounds on a pair of shoes? Are you mad?
   • He's got this mad idea that he's irresistible to women.
2. •
   Extremely foolish or unwise; irrational; imprudent.
3. •
   (US) Angry; annoyed.

   • Are you mad at me?
4. •
   (informal) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.

   • Aren't you just mad for that red dress?
   • My wife is soccer-mad.
5. •
   (slang) Intensifier, signifying abundance or high quality of a thing; very, much, excellent or many.

   • I gotta give you mad props for scoring us those tickets. Their lead guitarist has mad skills. There are always mad girls at those parties.
6. •
   (UK, informal) Bizarre; incredible.

   • It's mad that I got that job back a day after being fired.
7. •
   Abnormally ferocious or furious; or, rabid, affected with rabies.
8. •
   Wildly confused or excited.

   • It is the land of graven images, and they are mad upon their idols. — 1611
9. •
   (US, informal) Used litotically to indicate satisfaction or approval.

   • Wow, you really made this pie from scratch? I'm not mad at it.
10. •
    Having impaired polarity.

verb2

1. •
   (US, informal) To madden, to anger, to frustrate.

   • This musick mads me, let it sound no more. — 1595
2. •
   (no longer used) To be or become mad.

   • The imperial Elizabetta gazed with surprise at the youthful and unpretending appearance of the little being that had set the world madding. — 1832

adverb1

1. •
   (dialect, slang) Intensifier; to a large degree; extremely; exceedingly; very; unbelievably.

   • He was driving mad slow.
   • It's mad hot today.

noun6

1. •
   Initialism of mutual assured destruction or mutually assured destruction.

   • But the American government worries that MAD-style deterrence will no longer work. Terrorists, for example, might not care about the threat of destruction. — 2005
2. •
   Initialism of mandibular advancement device.
3. •
   Initialism of magnetic anomaly detector.
4. •
   Acronym of mothers against decapentaplegic.
5. •
   Initialism of mothers against decapentaplegic.
6. •
   Acronym of magnetically-arrested disc, a type of black hole accretion disc.