The presence of a constellation of symptoms that create significant distress; impair work, school, family, relationships, or daily living; or lead to significant risk or harm
Abnormality and Insanity are not Synonymous with a Psychological Disorder
Insanity is a legal term. Insanity is being unable to appreciate the nature and quality of the wrongfulness of his or her acts, because of mental disease or defect.
Abnormality is a condition or behavior that deviates from the usual physical or psychological state. Culture and context are important in defining abnormality. Talking to the dead is normal in some cultures.