ἀθεμείλιος
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
English (LSJ)
ον, without foundation, Ep. word implied by Hsch. ἀθέμηλος· οὐδὸν οὐκ ἔχουσα οὐδὲ θεμέλιον, and ἀθεμίλιος· ἀκροσφαλής, ψεύστης.