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cocksure

[kok-shoo r, -shur] /ˈkɒkˈʃʊər, -ˈʃɜr/
adjective
1.
perfectly sure or certain; completely confident in one's own mind:
She was cocksure that she was able to do the job better than anyone else.
2.
too certain; overconfident:
He was so cocksure he would win the election that he didn't even bother to campaign.
3.
Obsolete. perfectly secure or safe.
Origin
1510-1520
1510-20; cock1 + sure
Related forms
cocksurely, adverb
cocksureness, noun
Synonyms
1. cocky, arrogant, conceited.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cocksureness'

cocksure

/ˌkɒkˈʃʊə; -ˈʃɔː/
adjective
1.
overconfident; arrogant
Derived Forms
cocksurely, adverb
cocksureness, noun
Word Origin
C16: of uncertain origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for cocksureness'

cocksure

adj.

1520s, "certain," from cock (n.1) + sure (adj.). Probably "as assured as a cock." "The word was originally perfectly dignified, and habitually used in the most solemn connexions" [OED].

Online Etymology Dictionary, © 2010 Douglas Harper
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