The Collaborative International Dictionary of English v.0.48:

Disconsolate \Dis*con"so*late\, a. [LL. disconsolatus; L. dis- +
   consolatus, p. p. of consolari to console. See Console, v.
   t.]
   1. Destitute of consolation; deeply dejected and dispirited;
      hopelessly sad; comfortless; filled with grief; as, a
      bereaved and disconsolate parent.
      [1913 Webster]

            One morn a Peri at the gate
            Of Eden stood disconsolate.           --Moore.
      [1913 Webster]

            The ladies and the knights, no shelter nigh,
            Were dropping wet, disconsolate and wan. --Dryden.
      [1913 Webster]

   2. Inspiring dejection; saddening; cheerless; as, the
      disconsolate darkness of the winter nights. --Ray.

   Syn: Forlorn; melancholy; sorrowful; desolate; woeful;
        hopeless; gloomy. -- Dis*con"so*late*ly, adv. --
        Dis*con"so*late*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

disconsolateness
    n 1: feeling downcast and disheartened and hopeless [syn:
         despondency, despondence, heartsickness,
         disconsolateness]