Se‐pul″chral (?), a. [L. sepulcralis: cf. F. sépulcral.] 1. Of or pertaining to burial, to the grave, or to monuments erected to the memory of the dead; as, a sepulchral stone; a sepulchral inscription.
2. Unnaturally low and grave; hollow in tone; — said of sound, especially of the voice.
This exaggerated dulling of the voice... giving what is commonly called a sepulchral tone. H. Sweet.