ἄηχος
From LSJ
ἄπαγ' ἐς μακαρίαν ἐκποδών → get lost, buzz off, on yer bike, bug off, bugger off, clear out, clear off, take a hike, beat it, scram, get out of here, get outta here
English (LSJ)
ον,
A without sound, φωνή Aret.SD1.11, Sch E.Ph.960.
German (Pape)
[Seite 45] lautlos, Sp., z. B. Schol. Eur. Phoen. 967.