megalomaniac
adjective/ˌmeɡələˈmeɪniæk/
/ˌmeɡələˈmeɪniæk/
- (disapproving) showing a strong feeling that you want to have more and more power
- The megalomaniac leader finally crowned himself Emperor.
- There was a megalomaniac streak in him that made him believe anything was possible.
- (psychology) affected by a mental illness in which somebody has a much greater belief in their own importance or power than is reasonable
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megalomaniac