The Collaborative International Dictionary of English v.0.48:

Unaccomplished \Un`ac*com"plished\, a.
   Not accomplished or performed; unfinished; also, deficient in
   accomplishment; unrefined.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "unaccomplished":
   amateurish, arcane, cabalistic, impenetrable, inscrutable, mystic,
   neglected, numinous, semiskilled, unachieved, unattained,
   unbusinesslike, uncoached, uncompleted, unconsummated,
   undischarged, undone, unendowed, unexecuted, unfinished,
   unfulfilled, ungifted, unguessed, uninitiated, unknowable,
   unperformed, unpolished, unprepared, unprimed, unprofessional,
   unrealized, unschooled, unskilled, untalented, untaught, untrained,
   untutored