egomania

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But his egomania was largely justified.
然而他的自大是有正当理由为前提的。
Some easterners recently quit the party, complaining of his “vindictive egomania”.
最近一些东德人退出该党，抱怨拉方丹“复仇心重”、“自大狂”。
Worse still, I was never able to distinguish his optimism from plain egomania; I would not have been surprised to hear him announce that he had invented a better tree.
更糟的是，我没法辨别，这些究竟是他的乐观主义，或仅仅是狂妄自大而已。所以，即便是他宣布他发明了一种更牛逼的树木，我也不会惊讶。

Yet for all the stories of greed and egomania, Karajan was a master conductor.
NPR: Herbert von Karajan's Symphonic Obsessions
But egomania is one of the more powerful forces that have shaped world history.
FORBES: What the World Got Wrong About Lance Armstrong and Oscar Pistorius
Now of course, people like Armstrong and Pistorius and Michael Jordan may work hard as part of a more general egomania.
FORBES: What the World Got Wrong About Lance Armstrong and Oscar Pistorius

the state of considering yourself to be very important and able to do anything that you want to do