o·ver·con·fi·dent

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

Origin:
1610–20; over- + confident

o·ver·con·fi·dence, noun
o·ver·con·fi·dent·ly, adverb


cocksure, brash, arrogant, reckless, heedless.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
overconfident (ˌəʊvəˈkɒnfɪdənt) [Click for IPA pronunciation guide]
 
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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00:10
Overconfident is always a great word to know.
So is bezoar. Does it mean:
a scrap or morsel of food left at a meal.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Etymonline
Word Origin & History

overconfident
1617, from over + confident.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Entrepreneurs are risk-averse towards market demand but are overconfident with
  respect to their own abilities.
We're generally overconfident in our opinions and our impressions and judgments.
In the scenarios they presented, the premise was that forecasters tend to be
  overconfident in their judgments.
These treacherous waters conceal the remains of ships whose crews were unwary,
  overconfident, or merely unfortunate.
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