defeatist

from WordNet (r) 3.0 (2006)

defeatist
    n 1: someone who is resigned to defeat without offering positive
         suggestions [syn: {defeatist}, {negativist}]

from Moby Thesaurus II by Grady Ward, 1.0

25 Moby Thesaurus words for "defeatist":
      Cassandra, Cassandra-like, Cassandran, Cassandrian, Eeyore,
      calamity howler, cynic, cynical, dismal, downbeat, gloomy, killjoy,
      malist, negative, negativist, negativistic, nihilist, nihilistic,
      pessimist, pessimistic, prophet of doom, retreatist, seek-sorrow,
      uncheerful, worrywart