Cocky
Part of speech: adjective
Definition: overly self-confident up to a point where you're kidding yourself of your abilities.
Part of speech: noun
Definition: Abbreviation of cockatoo, especially when talking to such a bird, as in "hello cocky". A farmer.
Example sentence: I believe in myself and maybe people take that as cocky and flash but in this game you have to believe in yourself or you won't get anywhere.
Assertive
Part of speech: adjective
Definition: boldly self-assured; aggressively confident; cocky
Example sentence: The Canadian spirit is cautious, observant and critical where the American is assertive.