WordNet (r) 3.0 (2006):

ungraded
    adj 1: (of roads) not leveled or drained; unsuitable for all
           year travel [syn: dirt, ungraded]
    2: not arranged in order hierarchically [syn: ungraded,
       unordered, unranked]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "ungraded":
   aimless, amorphous, capricious, casual, desultory, disarticulated,
   discontinuous, disjunct, disordered, dispersed, disproportionate,
   erratic, fitful, formless, frivolous, gratuitous, haphazard,
   hit-or-miss, immethodical, inchoate, incoherent, indiscriminate,
   irregular, meaningless, misshapen, nonsymmetrical, nonsystematic,
   nonuniform, orderless, planless, promiscuous, random, senseless,
   shapeless, spasmodic, sporadic, straggling, straggly, systemless,
   unarranged, unclassified, undirected, unjoined, unmethodical,
   unordered, unorganized, unsorted, unsymmetrical, unsystematic,
   ununiform, vague, wandering