What is the proper definition of psychopathy?
As the Wikipedia article on psychopathy makes clear, there are different definitions of psychpathy – and in fact there are different definitions of every scientific concept –, depending on which scholar you consult. This is not a problem, as every scientific publication will make clear which definition it uses.

The truth is that there is an ongoing discussion on what psychopathy is – and if it exists at all! It is no accident that both the International Classification of Diseases (ICD-10), which is the international standard diagnostic tool for medical and psychiatric conditions, and the Diagnostic and Statistical Manual (DSM-5), which is the international standard diagnostic tool for psychological disorders, do not contain the diagnosis psychopathy.