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1. An abnormal physical condition resulting from defective genes or developmental deficiencies
   - abnormalcy [US]
    
2. Retardation sufficient to fall outside the normal range of intelligence
   - mental defectiveness
    
3. Marked strangeness as a consequence of being abnormal
   - freakishness
    
4. Behaviour that breaches the rule or etiquette or custom or morality
   - irregularity

Derived forms: abnormalities

See also: abnormal

Type of: backwardness, mental retardation, misbehavior [US], misbehaviour [Brit, Cdn], misdeed, physical condition, physiological condition, physiological state, retardation, slowness, strangeness, subnormality, unfamiliarity

Antonym: normality

Encyclopedia: Abnormality