Lewis Short
(adjective) : optābĭlis, e, opto
* To be wished for, desirable (class.): quae expetenda atque optabilia videntur,Cic. de Or. 1, 51, 221: mihi pax imprimis fuit optabilis,id. Phil. 7, 3, 7: tempus,Ov. M. 9, 758: quae ut concurrant omnia, optabile est,Cic. Off. 1, 14, 33.—Comp.: bono viro optabilius,Cic. Pis. 14, 33.—Sup. seems not to occur.— Adv.: optābĭlĭter, desirably (post-class.). —Comp. optabilius, Val. Max. 5, 1, 6 ext.
Charlton T. Lewis, Charles Short, A Latin Dictionary