We have many many ways of describing people not behaving in a way that is considered "normal" or "healthy". Emotionally unbalanced paints a certain picture, though it does not really describe a behavioral pattern and it can be difficult to quantify. Narcissistic Personality Disorder is just shorthand for a constellation of behaviors and attitudes that are exhibited by people, but it can be esoteric to people who are familiar with the DSM or are in the mental health professions.
He appears to have a very fragile sense of himself which he covers with his bragging and self aggrandizement. He also seems to lack empathy and appears to view others not so much as unique and equal human beings, but as objects that he can either use, or as threats that he needs to eliminate. Trump engages in behaviors that are destructive to others, as well as to himself. The difference is that he has had the resources to shield himself from the greater damage that he has caused others throughout his life. I would imagine that if he did not have the resources and connections that his father's wealth has given him, that he would be in prison.
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