Nevertheless, he spends what little money he has in savings on alcohol and unnecessary items such as candy, video tapes, and what ever else he might want at the moment. John often dwells on how worthless he thinks he is, but also on how others do not treat him properly. When not aggressive, he is frequently depressed. Falling short of this specified ideal is an indication of mental illness. We all at some point deviate from or fall short of the ideal.
Abnormal behavior is a symptom of a physical disorder.
This is a biogenic definition. The individual suffers from difficulties in concentration, leading to absent-mindedness, irritability and even delusions. To a certain extent each one captures a different aspect of the meaning of abnormality. But we do use some definition. All of you have some definition in your heads about what psychological abnormality is, whether or not you could clearly state it.