Sociopathy is a mental disorder that is synonymous with Antisocial Personality Disorder (ASPD), or psychopathy, in which the person with the disorder exhibits an unusually lethargic way of demonstrating empathy. In other words, empathy is severely lacking. The individuals who have been diagnosed with this disorder are also referred to in some cases as psychopaths.
Like many psychological disorders, the exact mechanism and etiology of this disorder is still unknown.
Many with the diagnosis are believed to lack a conscience, which is pivotal to a healthy psyche. Psychological treatment is therefore important for successful integration into society.
-  - the definition of sociopathy by Dictionary.com