megalomania

音标发音

Yet this very megalomania seems to be both the secret to his longevity and to his unhinged nature.
然而，極度的狂妄自大似乎正是他長久統治和錯亂心智背後的原因。
It seems that there is something advantageous in the megalomania that is his defining lifelong trait.
狂妄自大正是他長久統治的關鍵，看起來，這樣的品質似乎有些好処。
But it is fairer to think of him as just a moderately violent thug with a touch of megalomania, whose goons club rivals, who closes newspapers, harasses judges and bans public meetings.
公平來講，它不過是一個有些狂妄自大的溫和派激進分子，他的爪牙都是糾集在一起的，與傳媒聯系緊密、能夠枉法裁判以及禁止公共集會的部縱。

His megalomania did him in eventually, but at least he stopped the chaos for a while.
FORBES: Vaclav Havel and the Velvet Revolution in the Age of Social Media
As director and star, Van Peebles contracts a bad case of pulp megalomania—he assumes epic postures as he photographs himself against the big sky.
NEWYORKER: Posse
The absurd freelance diplomacy is not the only hint of megalomania that makes a third Livingstone term look undesirable (he originally said he would seek only one).
ECONOMIST: The lesson of London's funny but sad mayoral election

an unnaturally strong wish for power and control, or the belief that you are very much more important and powerful than you really are

Megalomania is the belief that you are more powerful and important than you really are. Megalomania is sometimes a mental illness.