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

1) irregularity, unconformity, unusualness, singularity, eccentricity, unconventionality, uncommonness, deviation, aberration, idiosyncrasy: The desire in a man to wear women's clothing is viewed as an abnormality. 2) distortion, anomaly, malformation, deformity: The child was born with an abnormality of the right foot.