WordNet (r) 3.0 (2006):

death wish
    n 1: (psychoanalysis) an unconscious urge to die [syn: death
         instinct, death wish, Thanatos]

Moby Thesaurus II by Grady Ward, 1.0:

31 Moby Thesaurus words for "death wish":
   Schmerz, Slough of Despond, blank despondency, dejectedness,
   dejection, depression, despair, despondency, despondentness,
   discouragement, disheartenment, dispiritedness, down trip,
   downcastness, downer, downheartedness, drooping spirits,
   heartlessness, hopelessness, low spirits, lowness,
   lowness of spirit, malaise, oppression, pessimism,
   self-destructive urge, sinking heart, spiritlessness,
   suicidal despair, taedium vitae, weariness of life