bigheadedness

big head

n.
1. Informal Conceit; egotism.
2. also big·head (bĭg′hĕd′) Any of various diseases of animals, especially rams, characterized by swelling of the head, face, or neck.
big′head′ed adj.
big′head′ed·ness n.
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.
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bigheadedness

noun
Informal. An exaggerated belief in one's own importance:
egoism, egotism, self-importance.
Informal: bighead, swelled head.
The American Heritage® Roget's Thesaurus. Copyright © 2013, 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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