The Collaborative International Dictionary of English v.0.48:

Uninitiated \Uninitiated\
   See initiated.

WordNet (r) 3.0 (2006):

uninitiated
    adj 1: not initiated; deficient in relevant experience; "it
           seemed a bizarre ceremony to uninitiated western eyes";
           "he took part in the experiment as a naive subject" [syn:
           uninitiate, uninitiated, naive]

Moby Thesaurus II by Grady Ward, 1.0:

75 Moby Thesaurus words for "uninitiated":
   a novice at, a stranger to, amateurish, awkward, blankminded,
   callow, dumb, empty, empty-headed, fresh, gauche, green,
   green as grass, groping, ignorant, immature, inane, inexperienced,
   innocent, know-nothing, naive, nescient, new to, raw, semiskilled,
   simple, strange to, tentative, unaccomplished, unaccustomed to,
   unacquainted, unacquainted with, unapprized, unbusinesslike,
   uncoached, uncomprehending, unconversant, unconversant with,
   undeveloped, unendowed, unenlightened, unexperienced, unfamiliar,
   unfamiliar with, unfinished, unfledged, ungifted, unilluminated,
   uninformed, uninitiated in, unintelligent, unknowing, unmatured,
   unpolished, unposted, unpracticed, unpracticed in, unprepared,
   unprimed, unprofessional, unripe, unschooled, unseasoned,
   unskilled, unskilled in, unsure, untalented, untaught, untrained,
   untried, untutored, unused to, unversed, unversed in, vacuous