The Oxford Thesaurus An A-Z Dictionary of Synonyms - eccentricityn.

1) unconventionality, unusualness, uncommonness, irregularity, nonconformity, individuality, individualism, singularity, uniqueness, strangeness, oddness, bizarreness, distinctiveness, capriciousness, weirdness: Why should someone be criticized for eccentricity? 2 idiosyncrasy, quirk, peculiarity, mannerism, crotchet, aberration, anomaly, oddity, curiosity, caprice: Eating crackers in bed is only one of her eccentricities.