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English word mad comes from Old English ġemǣdan, Proto-Indo-European *meyth₂-, and later Proto-Germanic *maidaz (Angry, enraged. Hurt, wounded. Mad, foolish.)
ġemǣdan (Old English)
*meyth₂- (Proto-Indo-European)
*moyth₂ós (Proto-Indo-European)
*maidaz (Proto-Germanic)
Angry, enraged. Hurt, wounded. Mad, foolish.
ġemād (Old English)
ġemǣded (Old English)
medd (Middle English)
mad (English)
(chiefly, US; UK dated + regional) Angry, annoyed.. (colloquial, usually with for or about) Extremely enthusiastic about; crazy about; infatuated with; overcome with desire for.. (of a compass needle) Having impaired polarity.. (of animals) Abnormally ferocious or furious; or, rabid, affected with rabies.. (slang, chiefly Northeastern US) Intensifier, signifies an abundance or high quality [...]