WordNet (r) 3.0 (2006):

unclassified
    adj 1: not subject to a security classification [ant:
           classified]
    2: not arranged in any specific grouping [ant: classified]

Moby Thesaurus II by Grady Ward, 1.0:

96 Moby Thesaurus words for "unclassified":
   able, aimless, amorphous, bald, bare, capricious, casual,
   desultory, disarticulated, disclosed, discontinuous, disjunct,
   disordered, dispersed, disproportionate, enigmatic, erratic,
   exposed, fitful, formless, frivolous, gratuitous, haphazard,
   hit-or-miss, immethodical, incalculable, inchoate, incognizable,
   incoherent, indiscriminate, irregular, meaningless, misshapen,
   mysterious, naked, nonsymmetrical, nonsystematic, nonuniform, open,
   open as day, open to all, orderless, overt, planless, promiscuous,
   puzzling, random, revealed, sealed, senseless, shapeless,
   spasmodic, sporadic, straggling, straggly, strange, systemless,
   unapparent, unapprehended, unarranged, unascertained, unbeknown,
   uncharted, undirected, undisclosed, undiscoverable, undiscovered,
   undivulged, unexplained, unexplored, unexposed, unfamiliar,
   unfathomed, ungraded, unheard, unheard-of, unidentified,
   uninvestigated, unjoined, unknowable, unknown, unmethodical,
   unordered, unorganized, unperceived, unplumbed, unrevealed,
   unsorted, unsuspected, unsymmetrical, unsystematic, untouched,
   ununiform, vague, virgin, wandering