sepulchral

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. [ 1913 Webster ]

2. Unnaturally low and grave; hollow in tone; -- said of sound, especially of the voice. [ 1913 Webster ]

This exaggerated dulling of the voice . . . giving what is commonly called a sepulchral tone. H. Sweet. [ 1913 Webster ]