The Collaborative International Dictionary of English v.0.48:

Inconsolable \In`con*sol"a*ble\, a. [L. inconsolabilis: cf. F.
   inconsolable. See In- not, and Console.]
   Not consolable; incapable of being consoled; grieved beyond
   susceptibility of comfort; disconsolate. --Dryden.
   [1913 Webster]

         With inconsolable distress she griev'd,
         And from her cheek the rose of beauty fled. --Falconer.
   -- In`con*sol"a*ble*ness, n. -- In`con*sol"a*bly, adv.
   Inconsonance

WordNet (r) 3.0 (2006):

inconsolable
    adj 1: sad beyond comforting; incapable of being consoled;
           "inconsolable when her son died" [syn: inconsolable,
           disconsolate, unconsolable] [ant: consolable]