WordNet (r) 3.0 (2006):

nonuniform
    adj 1: not homogeneous [syn: inhomogeneous, nonuniform]

Moby Thesaurus II by Grady Ward, 1.0:

181 Moby Thesaurus words for "nonuniform":
   able to adapt, adaptable, adjustable, aimless, alterable,
   alterative, amorphous, broken, broken off, capricious, careening,
   casual, catchy, changeable, changing, checkered, chopped-off,
   choppy, contrasting, counter, decousu, desultory, deviating,
   deviative, deviatory, different, disarticulated, disconnected,
   discontinued, discontinuous, discrete, disjunct, disjunctive,
   disordered, disorderly, disparate, dispersed, disproportionate,
   dissimilar, divaricate, divergent, diverse, diversified,
   diversiform, eccentric, episodic, erose, erratic, ever-changing,
   fitful, flexible, flickering, fluctuating, fluid, formless,
   frivolous, gratuitous, guttering, halting, haphazard, hardly like,
   herky-jerky, heteroclite, hit-or-miss, immethodical, impermanent,
   impulsive, inchoate, incoherent, inconsistent, inconstant,
   indiscriminate, intermittent, intermitting, interrupted, irregular,
   jagged, jerky, kaleidoscopic, lurching, malleable, many-sided,
   meaningless, mercurial, metamorphic, misshapen, mobile, modifiable,
   motley, movable, mutable, nonconformist, noncontinuous, nonlinear,
   nonsequential, nonserial, nonstandard, nonsymmetrical,
   nonsystematic, odd, off, offbeat, orderless, out, parenthetic,
   patchy, permutable, planless, plastic, pluralistic, promiscuous,
   protean, proteiform, ragged, rambling, random, resilient, rough,
   rubbery, scarcely like, scrappy, senseless, shapeless, snatchy,
   spasmatic, spasmic, spasmodic, spastic, sporadic, spotty,
   staggering, straggling, straggly, supple, suspended, systemless,
   transient, transitory, unalike, unarranged, uncertain,
   unclassified, unconnected, undirected, unequable, unequal, uneven,
   ungraded, unidentical, unjoined, unlike, unmatched, unmethodical,
   unmetrical, unordered, unorganized, unorthodox, unregular,
   unresembling, unrhythmical, unsame, unsettled, unsimilar, unsorted,
   unstable, unsteady, unsuccessive, unsymmetrical, unsystematic,
   ununiform, vague, variable, variegated, variform, various, varying,
   veering, wandering, wavering, wobbling, wobbly