mutter
From LSJ
English > Greek (Woodhouse)
verb transitive and absolute
whisper: Ar. and P. ψιθυρίζειν.
mumble (absol.): Ar. τονθορύζειν, μασταρύζειν.
make a sound (absol.); P. and V. ψοφεῖν.
murmur: Ar. and P. θορυβεῖν, γρύζειν.
complain: Ar. and P. σχετλιάζειν.
make a low sound: Ar. and V. μύζειν.