ἀθυρόγλωττος
From LSJ
ἐν πιθήκοις ὄντα δεῖ εἶναι πίθηκον → in Rome we do as the Romans do | when in Rome, do as the Romans do | when in Rome, do as the Romans | when in Rome, do like the Romans do | when in Rome | being among monkeys one has to be a monkey
English (LSJ)
ον,
A one that cannot keep his mouth shut, ceaseless babbler, E. Or. 903 (-γλωσσος).
Greek (Liddell-Scott)
ἀθῠρόγλωττος: -ον, ὁ μὴ δυνάμενος νὰ τηρήσῃ τὸ στόμα κλειστὸν ἐκ τῆς ἀθυρογλωσσίας (ᾧ γλώσσῃ θύραι οὐκ ἐπίκεινται, Θέογν. 421), ὁ ἔχων στόμα ἀπύλωτον, ὁ ἀδιακόπως λαλῶν, Εὐρ. Ὀρ. 903.