ἄφθεγκτος

ον, Adv.
A. = ἄφθογγος, voiceless, μηνυτήρ A. Eu. 245; στόμα (of a pen) AP 9.162; ἀστράγαλοι ib.7.427.14 (Antip. Sid.).
2. of places, etc., where none may speak, τῷδ’ ἐν ἀφθέγκτῳ νάπει S. OC 156 (lyr.).
II. Pass., unspeakable, unutterable, B. Fr. 2.2, Pl. Sph. 238c. Adv. ‐τως Iamb. Myst. 7.4.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project