stŭpĭdĭtas

ātis, f.

stupidus

I. senselessness, dullness, stupidity (very rare), Att. ap. Non. 226, 22 (Trag. Rel. v. 287 Rib.): incredibilis, * Cic. Phil. 2, 32, 80.
Lewis & Short
A Latin Dictionary, 1879
An open-access project