εὔδια

From LSJ

φωνὰ τύ τίς ἐσσι καὶ οὐδὲν ἄλλο → it's all voice you are, and nothing else | it's all voice ye are, and nought else

Source

Russian (Dvoretsky)

εὔδια: adv. спокойно, безмятежно (πόντος πορφύρεται Anth.).