1) Egomania can be such a bore.

2) But his egomania was largely justified.

3) You should marry me at the outset such good woman perhaps is right, but I marry you such egomania is a fault absolutely!

4) Europe's powers would have fought over their differences without Napoleon. But the scale and ferocity of conflict was due in large part to the emperor's "aggression, egomania and lust for power".

5) 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.