ἀφώνητος

ον
A. unspeakable, unutterable, ἄχος Pi. P. 4.237.
II. voiceless, speechless, παρέσχε φωνὴν τοῖς ἀ. S. OC 1283.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project