egomaniac
noun/ˌiːɡəʊˈmeɪniæk/, /ˌeɡəʊˈmeɪniæk/
/ˌiːɡəʊˈmeɪniæk/
- a person who is extremely interested in or concerned about themselves, in a way that is not reasonable
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egomaniac
Definition of egomaniac noun from the Oxford Advanced Learner's Dictionary