ignōrābĭlis — Lewis & Short
ignōrābĭlis, e, adj.ignoro,
I unknown (rare but class.): separare, quod levius, facilius, non ignorabile, non fortuitum, non necessarium fuerit, * Cic. Inv. 2, 32, 99:
libri litteris ignorabilibus praenotati,App. M. 11, p. 268:
alterum illud ignorabilius obscuriusque est,Gell. 9, 12, 4 (Plaut. Ps. 2, 1, 18, false reading for ignobilis).— * Adv.: ignōrābĭlĭter, in an unknown manner:
laminae ignorabiliter litteratae,i. e. covered with unknown characters, App. M. 3, p. 137, 6.