Source : Webster's Revised Unabridged Dictionary (1913)

Unborn \Un*born"\, a.
   Not born; no yet brought into life; being still to appear;
   future.

         Some unborn sorrow, ripe in fortune's womb. --Shak.

         See future sons, and daughters yet unborn. --Pope.

Source : WordNet®

unborn
     adj : not yet brought into existence; "unborn generations" [ant: {born}]