swellheaded
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swell·head
(swĕl′hĕd′)n. Informal
A person regarded as arrogant or conceited.
swell′head′ed 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.
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swellheaded
adjectiveInformal. Thinking too highly of oneself:
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.