1. boldly or brashly self-confident; conceited
don't be so cocky!
'Cocky' is an adjective used to describe someone overly confident or arrogant. This comes from the image of a cockerel (male chicken) strutting confidently around the pen. This adjective has a negative connotation and is often associated particularly with male behaviour. "He acts like he has all the answers and interrupts me all the time, he is so cocky." This adjective might be used more often in social contexts.