The Collaborative International Dictionary of English v.0.48:

Funereal \Fu*ne"re*al\, a. [L. funereus, fr. fentus a funeral.]
   Suiting a funeral; pertaining to burial; solemn; as, at a
   funereal pace. Hence: Dark; dismal; mournful. --Jer. Taylor.
   [1913 Webster]

         What seem to us but sad funereal tapers May be heaven's
         distant lamps.                           --Longfellow.
   -- Fu*ne"re*al*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

funereal
    adj 1: suited to or suggestive of a grave or burial; "funereal
           gloom"; "hollow sepulchral tones" [syn: funereal,
           sepulchral]

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "funereal":
   Acheronian, Acherontic, Cimmerian, Stygian, black, blackish, bleak,
   cinerary, clouded, cloudy, dark, dark and gloomy, dark-colored,
   darkish, darksome, depressing, depressive, dirgelike,
   disheartening, dismal, doleful, drear, drearisome, dreary, dusk,
   dusky, epitaphic, exequial, feral, funebrial, funebrious,
   funebrous, funeral, funerary, gloomful, glooming, gloomy, grave,
   gray, grievous, grim, ill-lighted, ill-lit, lowering, lugubrious,
   melancholy, morose, mortuary, mournful, necrological, nigrescent,
   obituary, obsequial, oppressive, overcast, sad, saturnine,
   sepulchral, sober, solemn, somber, sombrous, sorrowful, stormy,
   swart, swarthy, triste, unhappy, weariful, wearisome, weary,
   woeful