egomania
US /ˌiː.ɡoʊˈmeɪ.ni.ə/
UK /ˌiː.ɡoʊˈmeɪ.ni.ə/
1.
an obsessive preoccupation with oneself; extreme egocentrism.
:
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His unchecked egomania led to the downfall of his company.
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The dictator's egomania knew no bounds, leading to widespread suffering.