vanitudo

vānĭtūdo, ĭnis, f. [id.], emptiness, nothingness, vainglory, vanity (ante-class.): ne turpasse vanitudine aetatem suam, Pac. ap. Non. 184, 7:

vera vanitudine convincere,

by empty, lying talk, Plaut. Capt. 3, 4, 37.