Farmer’s Slang & Its Analogues. 1890–1909, rev. 2022.
Brain-foolery
subs. phr. (old colloquial).—Folly.
1
1606. CHAPMAN, Monsieur D’Olive, v. The very essence of his soule is pure villany: The substance of his BRAINE-FOOLERY: one that beleeues nothing from the starres vpward.
