severitudo

sĕvērĭtūdo, ĭnis, f. [1. severus],

• gravity, austerity, severity (ante- and post-class. for the class. severitas): (frontis) Plaut. Ep. 5, 1, 3 (609) (also cited Non. 173, 10): morum, Ap. Met. 1, 25, 14.