megalomania
noun [ U ] uk/ˌmeɡ.əl.əˈmeɪ.ni.ə/ us/ˌmeɡ.əl.əˈmeɪ.ni.ə/
夸大狂，自大狂;妄自尊大
an unnaturally strong wish for power and control, or the belief that you are very much more important and powerful than you really are
megalomaniac
noun [ C ] uk/ˌmeɡ.əl.əˈmeɪ.ni.æk/ us/ˌmeɡ.əl.əˈmeɪ.ni.æk/
妄自尊大的人，夸大狂患者