ἀρρανής
From LSJ
χαῖρ', ὦ μέγ' ἀχρειόγελως ὅμιλε, ταῖς ἐπίβδαις, τῆς ἡμετέρας σοφίας κριτὴς ἄριστε πάντων → all hail, throng that laughs untimely on the day after the festival, best of all judges of our poetic skill
Spanish (DGE)
-ές
quizá f.l. por ἀρραγής irrompible, inquebrantable πέτραν ... τὴν ἀρρανῆ ... τοῦ Σωτῆρος δύναμιν ὀνομάζει Cyr.Al.M.70.701B.