What is another word for "irregularity"?

Roget's Thesaurus (1911) lists these synonyms for "irregularity": accord, accordance, agreement, all, always, and, assimilate, become, capricious, clockwork, conform, conformably, conformity, connatural, connaturality, connaturalness, consistency, consistent, consonance, constancy, desultory, dissimilarity, dissimilitude, divarication, divergence, diversified, diversity, dress, even, everywhere, exception, fail, fitful, harmony, here, homogeneity, homogeneous, homogeneousness, homologous, homology.