1.  unevenness(n = noun.attribute) variability - the quality of being uneven and lacking uniformity;
Antonym: evenness
Derived form adjective uneven₁, adjective uneven₅

2.  unevenness(n = noun.attribute) - the quality of being unbalanced;
Antonym: evenness
Derived form adjective uneven₂

N  nonuniformity, diversity, irregularity, unevenness, multiformity, unconformity, roughness, dissimilarity, dissimilitude, divarication, divergence, diversified varied, irregular, uneven, rough, multifarious, multiform, of various kinds, all manner of, all sorts of, all kinds of, variously, in all manner of ways, here there and everywhere.

N  inequality, disparity, imparity, odds, difference, unevenness, inclination of the balance, partiality, bias, weight, shortcoming, casting weight, make-weight, superiority, inferiority, inequation, unequal, uneven, disparate, partial, unbalanced, overbalanced, top-heavy, lopsided, biased, skewed, disquiparant, haud passibus aequis.