cool adjective definition in Confident topic from the Oxford Advanced Learner's Dictionary

cool

 adjective: Confident topic
(informal) calm and confident in a way that lacks respect for other people, but makes people admire you as well as disapprove She just took his keys and walked out with them, cool as you please. He was a cool customer. No one would think to look for him in a city where he’d been arrested for killing a cop.