WordNet (r) 3.0 (2006):

manque
    adj 1: unfulfilled or frustrated in realizing an ambition [syn:
           manque, would-be(a)]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "manque":
   abortive, bootless, failed, failing, fruitless, futile,
   ineffective, ineffectual, inefficacious, lame, miscarried,
   miscarrying, of no effect, stickit, stillborn, successless,
   unfortunate, unsuccessful, useless