Unvoiced

(ppl.) a. (UN-¹ 8, 9. Cf. VOICE v. 5, 7 b.)

1859.  Emerson, Art & Criticism, Wks. 1903, XII. 298. A book holding so many memorable and heroic facts,… things unvoiced before.

1874.  Holland, Mistr. Manse, i. 10. That word, ineffable to man,… Remains unvoiced since time began.

1881.  W. E. Dickson, Pract. Organ-building, ix. 119. A wooden pipe, similarly put together but unvoiced.