The Collaborative International Dictionary of English v.0.48:

Unformed \Un*formed"\, a. [In sense 1 properly p. p. of un form;
   in senses 2 and 3 pref. un- not + formed.]
   [1913 Webster]
   1. Decomposed, or resolved into parts; having the form
      destroyed.
      [1913 Webster]

   2. Not formed; not arranged into regular shape, order, or
      relations; shapeless; amorphous.
      [1913 Webster]

   3. (Biol.) Unorganized; without definite shape or structure;
      as, an unformed, or unorganized, ferment.
      [1913 Webster]

   Unformed stars (Astron.), stars not grouped into any
      constellation; informed stars. See Sporades.
      [1913 Webster]

WordNet (r) 3.0 (2006):

unformed
    adj 1: not having form or shape; "unformed clay" [ant: formed]
    2: not formed or organized; "an as yet unformed government"

Moby Thesaurus II by Grady Ward, 1.0:

69 Moby Thesaurus words for "unformed":
   amorphous, arrested, backward, budding, callow, coarse, crude,
   dewy, embryonic, green, growing, immature, impubic, in embryo,
   in ovo, in the rough, inchoate, inexperienced, ingenuous, innocent,
   intact, juicy, minor, naive, new-fledged, oversimple, raw,
   reductionistic, reductive, ripening, rough, roughcast, roughhewn,
   rude, rudimental, rudimentary, sappy, shapeless, simplistic,
   stunted, tender, unadult, unblown, uncultivated, uncultured, uncut,
   underage, underdeveloped, undeveloped, undressed, unfashioned,
   unfinished, unfledged, unhewn, unlabored, unlicked, unmellowed,
   unpolished, unprocessed, unrefined, unripe, unseasoned, unshaped,
   unshapen, untreated, unworked, unwrought, vernal, virginal