fătŭĭtas

ātis, f.

1. fatuus

I. foolishness, folly, silliness, fatuity (very rare), Cic. Inv. 2, 32, 99; id. Att. 11, 25, 2; Firm. Math. 8, 19; Vulg. Prov. 16, 22; August. Ep. 65.
Lewis & Short
A Latin Dictionary, 1879
An open-access project