over-confident

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
Over-confident is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Etymonline
Word Origin & History

overconfident
1617, from over + confident.
Online Etymology Dictionary, © 2010 Douglas Harper
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