ἄρρητος
ἄρρητος
unspoken, unsaid, Lat. indictus, Od., etc.; οὐκ ἐπʼ ἀρρήτοις λόγοις not without warning spoken, Soph.
not to be spoken, not to be divulged, of sacred mysteries, Hdt., Eur., etc.; διδακτά τε ἄρρητά τʼ, i. e. things profane and sacred, Soph.
unutterable, inexpressible, horrible, Lat. nefandus, Soph., Eur.; ἄρρητʼ ἀρρήτων "deeds without a name, " Soph.
shameful to be spoken, Soph.; ῥητὰ καὶ ἄρρητα, "dicenda tacenda, " Dem.
in Mathem., ἄρρητα, irrational quantities, surds, Plat.