The Collaborative International Dictionary of English v.0.48:

Stillborn \Still"born`\, a.
   1. Dead at the birth; as, a stillborn child.
      [1913 Webster]

   2. Fig.: Abortive; as, a stillborn poem. --Swift.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stillborn
    adj 1: failing to accomplish an intended result; "an abortive
           revolt"; "a stillborn plot to assassinate the President"
           [syn: abortive, stillborn, unsuccessful]
    2: (of newborn infant) showing no signs of life at birth; not
       liveborn; "a stillborn baby"

Moby Thesaurus II by Grady Ward, 1.0:

78 Moby Thesaurus words for "stillborn":
   abortive, asleep, asleep in Jesus, at rest, bearing,
   bereft of life, bootless, born, breathless, called home, calved,
   carrion, cast, croaked, dead, dead and gone, death-struck,
   deceased, defunct, demised, departed, departed this life,
   destitute of life, done for, dropped, exanimate, failed, failing,
   fallen, finished, foaled, food for worms, fruitless, futile,
   given birth, giving birth, gone, gone to glory, gone west, hatched,
   inanimate, ineffective, ineffectual, inefficacious, lame, late,
   late lamented, launched into eternity, lifeless, manque, martyred,
   miscarried, miscarrying, nee, newborn, no more, of no effect,
   passed on, pushing up daisies, released, reposing, resting easy,
   sainted, sleeping, smitten with death, stickit, still, successless,
   taken away, taken off, unfortunate, unsuccessful, useless, whelped,
   with the Lord, with the saints, without life,
   without vital functions