dissimilarity(n = noun.attribute) unsimilarity - the quality of being dissimilar;
is a kind of difference
has particulars: disparateness, distinctiveness, heterology, dissimilitude, unlikeness, nonuniformity
Antonym: similarity
Derived forms adjective dissimilar₃, adjective dissimilar₂, adjective dissimilar₁

N  difference, variance, variation, variety, diversity, dissimilarity, disagreement, disparity, distinction, contradistinction, alteration, modification, permutation, moods and tenses, nice distinction, fine distinction, delicate distinction, subtle distinction, shade of difference, nuance, discrimination, differentia, different thing, something else, apple off another tree, another pair of shoes, horse of a different color, this that or the other, differing, different, diverse, heterogeneous, multifarious, polyglot, distinguishable, dissimilar, varied, modified, diversified, various, divers, all manner of, all kinds of, variform, daedal, other, another, not the same, unequal, unmatched, widely apart, poles apart, distinctive, characteristic, discriminative, distinguishing, incommensurable, incommensurate, differently, il y a fagots et fagots.

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  dissimilarity, dissimilaritude, unlikeness, diversity, disparity, dissemblance, divergence, variation, difference, novelty, originality, creativeness, oogamy, dissimilar, unlike, disparate, divergent, of a different kind, unmatched, unique, new, novel, unprecedented, original, nothing of the kind, no such thing, quite another thing, far from it, cast in a different mold, tertium quid, as like a dock as a daisy, very like a whale, as different as chalk from cheese, as different as Macedon and Monmouth, lucus a non lucendo, diversified, otherwise, diis aliter visum, no more like my father than I to Hercules.

N  multiformity, omniformity, variety, diversity, multifariousness, varied assortment, dissimilarity, polymorphous, multiform, multifold, multifarious, multigenerous, multiplex, heterogeneous, diversified, dissimilar, various, varied, variform, manifold, many-sided, variegated, motley, mosaic, epicene, indiscriminate, desultory, irregular, mixed, different, assorted, mingled, odd, diverse, divers, all manner of, of every description, of all sorts and kinds, et hoc genus omne, and what not? de omnibus rebus et quibusdam aliis, jumbled, confused, mixed up, discordant, inharmonious, unmatched, unrelated, nonuniform, omniform, omnigenous, omnifarious, protean (form), harmoniously confused, variety's the very spice of life.