untrained

from WordNet (r) 3.0 (2006)

untrained
    adj 1: not disciplined or conditioned or made adept by training;
           "an untrained voice"; "untrained troops"; "young minds
           untrained in the habit of concentration" [ant: {trained}]

from The Collaborative International Dictionary of English v.0.48

Untrained \Un*trained"\, a.
   1. Not trained. --Shak.
      [1913 Webster]

   2. Not trainable; indocile. [Obs.] --Herbert.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

37 Moby Thesaurus words for "untrained":
      a stranger to, amateurish, disaccustomed, ignorant, inexperienced,
      new to, rusty, semiskilled, unaccomplished, unaccustomed,
      unacquainted with, unbusinesslike, uncoached, unconversant with,
      unendowed, unfamiliar with, unfinished, ungifted, unhabituated,
      unhardened, uninitiated, uninured, unpolished, unpracticed,
      unprepared, unprimed, unprofessional, unschooled, unseasoned,
      unskilled, untalented, untaught, untutored, unused, unused to,
      unwonted, weaned