Lewis Short
(adjective) : in-concussus, a, um
* Unshaken, undisturbed, firm, constant, unchanged (post-Aug.).
* Lit.: caelestia sidera,Luc. 2, 268; so, vestigia,id. 2, 248.
* Trop.: inconcussus ipse et immotus,Plin. Pan. 82, 2; cf.: inconcussus injuriā, Sen. de Ira, 3, 25: certaminibus,Tac. A. 2, 43 fin.: florebant hilares inconcussique Penates,Stat. S. 5, 1, 142: otium,Sen. Ep. 67 fin.: pax,Tac. H. 2, 6: gaudium,Sen. Vit. Beat. 3.—Adv.: inconcussē, firmly, resolutely, Cod. Th. 11, 61, 6; Aug. Retract. 1, 11.
Charlton T. Lewis, Charles Short, A Latin Dictionary