The Collaborative International Dictionary
Madbrain
Madbrain \Mad"brain`\, a.
Hot-headed; rash.
--Shak. -- n. A rash or hot-headed person.
Wiktionary
madbrain
n. (context archaic English) A rash or hotheaded person.
Usage examples of "madbrain".
It seems quite madbrained to me, besides showing a sad want of particularity.
Sharon sat in the front beside Lena and I was in the back, which was no hardship to me, as Lena drives like a madbrain.