Dissimilarity

Noun

 * 1) Not similar in appearance to something else, antonym of similarity

Thesaurus
contrariety, contrast, departure, deviation, difference, disaccord, disaccordance, disagreement, disconformity, discongruity, discord, discordance, discrepancy, discreteness, disparity, dissemblance, dissent, dissimilitude, dissonance, distance, distinction, distinctness, divarication, divergence, divergency, diversity, far cry, heterogeneity, inaccordance, incompatibility, incongruity, inconsistency, inconsonance, inequality, inharmoniousness, inharmony, irreconcilability, margin, mixture, nonconformity, odds, offset, opposition, otherness, separateness, severance, unconformity, unlikeness, unorthodoxy, variance, variation, variegation, variety