Lewis Short
(verb) : dē-sĭpĭo, ĕre (
* Perf. desipui, Lact. 2, 4, 4), and n. sapio. *
* Act., to render insipid (late Lat. and rare), Tert. Pudic. 13.
* Neutr., to be void of understanding, to be silly, foolish; to act foolishly (class.): summos viros desipere, delirare, dementes esse,Cic. N. D. 1, 34, 94: licet me desipere dicatis,id. Planc. 37; Cic. Verr. 2, 5, 46; id. Div. 2, 23, 51; Hor. S. 2, 3, 47; id. Ep. 1, 20, 9 al.: dulce est desipere in loco,to indulge in trifling,Hor. Od. 4, 12, 28.—With gen.: desipiebam mentis, cum, etc.,Plaut. Ep. 1, 2, 35: quippe mortale aeterno jungere desipere est,Lucr. 3, 802; cf. id. 5, 165 and 1043.—Of a person in a fever, etc., to be delirious, to rave: intra verba,Cels. 3, 18 init. —Hence, dēsĭpĭens, entis, P. a., foolish, silly: desipientis arrogantiae est,Cic. N. D. 2, 6, 16: estne quisquam ita desipiens, qui, etc. id. Div. 2, 23, 51.
Charlton T. Lewis, Charles Short, A Latin Dictionary