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 (mĕg′ə-lō-mā′nē-ə, -mān′yə)
1. A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence.
2. An obsession with grandiose or extravagant things or actions.

meg′a·lo·ma′ni·ac′ n.
meg′a·lo·ma·ni′a·cal (-mə-nī′ə-kəl), meg′a·lo·man′ic (-măn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.megalomanic - suffering from megalomaniamegalomanic - suffering from megalomania    
psychoneurotic, neurotic - affected with emotional disorder
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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If anyone has not been convinced by the Machiavellian, megalomanic behaviour of the EU both before and during the negotiations that the EU is truly evil then there is no help for them.
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So paranoid, so power-hungry, so megalomanic (sic)." Assange had been a member of the hacker world, with the pseudonym of Mendax, and had been "a member of the famous International Subversives," in which he was "one of the greatest hackers in the world." His lack of consideration for others is evident in a variety of ways, which include a contempt for other hackers; no sense of obligation to those who donated money to WikiLeaks; and, among other things, the appropriation of other people's property.
They even gave this arrogant megalomanic a knighthood.
This isn't, of course, always a good thing, particularly if the chef is a ham-fisted egotist with megalomanic tendencies.