FURIOSUS. An insane man; a madman; a lunatic.

2. In general, such a man can make no contract, because he has no capacity or will: Furiosus nullum negotium genere potest, quia non intelligit quod agit. Inst. 3, 20, 8. Indeed, he is considered so incapable of exercising a will, that the law treats him as if he were absent: Furiosi nulla voluntas est. Furiosus absentia loco est. Dig. lib. 1, tit. ult. 1. 40, 1. 124, §1. See Insane; Non compos mentis.