megalomaniac - Dictionary Definition : Vocabulary.com
www.vocabulary.com/dictionary/megalomaniac
A megalomaniac is a pathological egotist, that is, someone with a psychological disorder with symptoms like delusions of grandeur and an obsession with power. We also use the word megalomaniac more informally for people who behave as if they're convinced of their absolute power and greatness.
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You don't think the Donald is an egotist, has delusions of grandeur and an obsession with power? He DOES think he's great and talks about himself way too much, IMHO.
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Can we agree on Narcissism?
........narcissist. This is different from self-confidence alone. The world of the narcissist is all about good/bad, superior/inferior, and right/wrong. There is a definite hierarchy, with the narcissist at the top—which is the only place he feels safe...."
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The above definitions do not mean I like/dislike him.
I'm just saying that he always talks about himself and how great he is/and how great everything is that he does.
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We can also agree to disagree, too. 
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