definitions of abnormality

• Deviation from ideal mental health

  Not meeting criteria which suggest you are mentally healthy
• Deviation from social norms

  A behaviour that deviates from social norms is one that is very different from how we would expect people to behave
• Failure to function adequately

  When a person's behaviour means they are unable to cope with the demands of everyday life
• Statistical infrequency

  A behaviour that is statistically infrequent does not happen very often