Cocky (adjective)

Having or showing an excessive self-confidence or self-assurance; arrogant.

Origin:

Cocky is believed to be derived from the word cock, meaning a male bird, as well as the word cock, meaning to swagger or show off. it first appeared in the english language in the late 19th century.

Examples:

1. He walked into the room with a cocky swagger.
2. She was so cocky that she thought she could win the race without even training.
3. The way he talked was so cocky that I was sure he would fail.
4. He was so cocky that he didn't even bother to prepare for the exam.
5. She had a cocky attitude and thought she was better than everyone else.