imperspicuus
From LSJ
ἀγεωμέτρητος μηδεὶς εἰσίτω → no one ignorant of geometry may enter, let no one ignorant of geometry enter, let no one ignorant of geometry come in
imperspĭcŭus: (inp-), a, um, adj. 2. in-perspicuus,
I not clear, obscure: judicum ingenia, Plin. Ep. 1, 20, 17.