Definition of cocky adjective from the Oxford Advanced Learner's Dictionary

 

cocky

 adjective
adjective
BrE BrE//ˈkɒki//
 
; NAmE NAmE//ˈkɑːki//
 
(cockier, cockiest)(informal) Confident
 
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too confident about yourself in a way that annoys other people For a young man on his first day at work he’s remarkably cocky. See related entries: Confident Word Origin mid 16th cent. (in the sense ‘lecherous’): from cock + -y.Extra examples For a young man on his first day at work he’s remarkably cocky. I’m fed up with his cocky attitude. They get a bit cocky and think they can do what they want.
See the Oxford Advanced American Dictionary entry: cocky