overconfident

[oh-ver-kon-fi-duhnt]
adjective
too confident.

Origin:
1610–20; over- + confident

overconfidence, noun
overconfidently, adverb


cocksure, brash, arrogant, reckless, heedless.
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World English Dictionary
overconfident (ˌəʊvəˈkɒnfɪdənt)
 
adj
excessively confident
 
over'confidence
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

overconfident
1617, from over + confident.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Critics also argue that financial education may make people overconfident, and
  therefore more likely to make bad decisions.
But it's also because market professionals appear to be chronically
  overconfident.
Trouble has a habit of striking places that avoided the previous crisis and
  became overconfident.
He grew overconfident, borrowing to expand his business and venture into
  property.
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