mad

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mad out of one's mind, foolish, (now) insanely foolish; wildly excited, furious. XIII (mad, med). Aphetic of ME. † amad, repr. OE. ǵemǣd(d), ġemǣded, pp. of *ġemǣdan render insane, f. ġemād insane = OS. gimēd foolish, OHG. gameit, kimeit foolish, vain, boastful. Goth. gamaips crippled:- Gmc. *ʒamaiōaz, f. *ʒa- y- + *maiða- :- IE. *moitó-, pp. formation on *moi- *mei- change (cf. L. mūtāre); cf. Goth. maidjan adulterate, inmaideins exchange.
Hence madden XVIII (-EN5); superseded mad vb. (XIV) in gen. use.

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