Lewis Short
anxĭtūdo | anxĭĕtūdo, ĭnis (noun F.f) : f. (mostly ante-class.), and , , f. (post-class. for the class. anxietas) [id.]
* Anxiety, trouble, anguish: animi, Pac. ap. Non. p. 72, 33; Att. ib. 28; 29.—Once also in Cic.: anxitudo prona ad luctum, Rep. 2, 41: macerabatur anxietudine,Aug. Conf, 9, 3: anxietudinis poena,Paul. Nol. Ep. 14.
Charlton T. Lewis, Charles Short, A Latin Dictionary