1.  sepulchral(a = adj.pert) - of or relating to a sepulchre; "sepulchral inscriptions"; "sepulchral monuments in churches"
Derived form noun sepulchre₁

2.  sepulchral(s = adj.all) charnel, ghastly - gruesomely indicative of death or the dead; "a charnel smell came from the chest filled with dead men's bones"; "ghastly shrieks"; "the sepulchral darkness of the catacombs"

3.  sepulchral(s = adj.all) funereal - suited to or suggestive of a grave or burial; "funereal gloom"; "hollow sepulchral tones"
Derived form noun sepulchre₁

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." [1913 Webster]

sepulchral, adj.
1 of a tomb or interment (sepulchral mound; sepulchral customs).
2 suggestive of the tomb, funereal, gloomy, dismal (sepulchral look).

Derivative:
sepulchrally adv.

Etymology:
F s{eacute}pulchral or L sepulchralis (as SEPULCHRE)

N  aphony, aphonia, dumbness, obmutescence, absence of voice, want of voice, dysphony, cacoepy, silence, raucity, harsh voice &c, unmusical voice, falsetto, childish treble mute, dummy, aphonous, dumb, mute, deafmute, deaf and dumb, mum, tongue-tied, breathless, tongueless, voiceless, speechless, wordless, mute as a fish, mute as a stockfish, mute as a mackerel, silent, muzzled, inarticulate, inaudible, croaking, raucous, hoarse, husky, dry, hollow, sepulchral, hoarse as a raven, rough, with bated breath, with the finger on the lips, sotto voce, in a low tone, in a cracked voice, in a broken voice, vox faucibus haesit.

N  interment, burial, sepulture, inhumation, obsequies, exequies, funeral, wake, pyre, funeral pile, cremation, funeral, funeral rite, funeral solemnity, kneel, passing bell, tolling, dirge, cypress, orbit, dead march, muffled drum, mortuary, undertaker, mute, elegy, funeral, funeral oration, funeral sermon, epitaph, graveclothes, shroud, winding sheet, cerecloth, cerement, coffin, shell, sarcophagus, urn, pall, bier, hearse, catafalque, cinerary urn, grave, pit, sepulcher, tomb, vault, crypt, catacomb, mausoleum, Golgotha, house of death, narrow house, cemetery, necropolis, burial place, burial ground, grave yard, church yard, God's acre, tope, cromlech, barrow, tumulus, cairn, ossuary, bone house, charnel house, dead house, morgue, lich gate, burning ghat, crematorium, crematory, dokhma, mastaba, potter's field, stupa, Tower of Silence, sexton, gravedigger, monument, cenotaph, shrine, grave stone, head stone, tomb stone, memento mori, hatchment, stone, obelisk, pyramid, exhumation, disinterment, necropsy, autopsy, post mortem examination, zoothapsis, burried, burial, funereal, funebrial, mortuary, sepulchral, cinerary, elegiac, necroscopic, in memoriam, post obit, post mortem, beneath the sod, hic jacet, ci-git, RIP, requiescat in pace, the lone couch of his everlasting sleep, without a grave- unknell'd, uncoffin'd, and unknown, in the dark union of insensate dust, the deep cold shadow of the tomb, Special Vitality.

N  resonance, ring, ringing, tintinabulation, reflexion, reflection, reverberation, echo, reecho, zap, zot, buzz (hiss), low note, base note, bass note, flat note, grave note, deep note, bass, basso, basso profondo, baritone, barytone, contralto, echo chamber, resonator, tinnitus, bell, doorbell, buzzer, gong, cymbals (musical instruments), sympathetic vibrations, natural frequency, coupled vibration frequency, overtone, resonating cavity, sounding board, tuning fork, tuning, squelch, frequency selection, resonator, resonator circuit, radio resonant structure, aromaticity, alternating double bonds, non-bonded resonance, pi clouds, unsaturation, double bond, (valence), resounding, resonant, reverberant, tinnient, tintinnabulary, sonorous, booming, deep-toned, deep-sounding, deep-mouthed, vibrant, hollow, sepulchral, gruff, sweet bells jangled, out of time and harsh, echoing down the mountain and through the dell.

N  stridor, creak, creaking, discord, stridor, roughness, sharpness cacophony, cacoepy, acute note, high note, soprano, treble, tenor, alto, falsetto, penny trumpet, voce di testa, creaking, stridulous, harsh, coarse, hoarse, horrisonous, rough, gruff, grum, sepulchral, hollow, sharp, high, acute, shrill, trumpet-toned, piercing, ear-piercing, high-pitched, high-toned, cracked, discordant, cacophonous.