ἄγρυκτος
From LSJ
ὃν οὐ τύπτει λόγος οὐδὲ ῥάβδος → if words don't get through, neither a beating will | if the carrot doesn't work, the stick will not work either | whom words do not strike, neither does the rod
English (LSJ)
ἄγρυκτον, (ἀ- priv., γρύζω) not to be spoken of, ἄγρυκτα παθεῖν Pherecr.157. ἀγρυξία, ἡ, dead silence, Pi.Fr.229.
Spanish (DGE)
-ον indecible ἄγρυκτα παθεῖν Pherecr.168.
Greek (Liddell-Scott)
ἄγρυκτος: -ον, (α στερητ., γρῦ) ἄρρητος, περὶ οὗ δὲν δύναταί τις νὰ εἴπῃ οὐδὲ γρῦ, ἄγρυκτα παθεῖν, Φερεκρ. Ἄδηλ. 20· - ἐντεῦθεν ἀγρυξία, ἡ· ἄκρα σιγή. Πινδ. Ἀποσπ. 253.