cocksure
adjective/ˌkɒkˈʃʊə(r)/, /ˌkɒkˈʃɔː(r)/
/ˌkɑːkˈʃʊr/
(old-fashioned, informal)- confident in a way that is annoying to other people and that they might find offensiveWord Originearly 16th cent.: from archaic cock (a euphemism for God) + sure; later associated with cock.
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cocksure