ἀρρανής

From LSJ

καλῶς δρῶν ἐξαμαρτεῖν μᾶλλοννικᾶν κακῶς → I would prefer to fail with honor than to win by evil | I prefer to fail by acting rightly rather than win by acting wrongly | Better fail by doing right, than win by doing wrong (Sophocles, Philoctetes 95)

Source

Spanish (DGE)

-ές
quizá f.l. por ἀρραγής irrompible, inquebrantable πέτραν ... τὴν ἀρρανῆ ... τοῦ Σωτῆρος δύναμιν ὀνομάζει Cyr.Al.M.70.701B.