disapproval Someone who is cocksure is so confident and sure of their abilities that they annoy other people. = cocky. too confident of your abilities or knowledge, in a way that is annoying to other people (cock word used to avoid saying (14-19 centuries) + sure)
marked by excessive confidence; "an arrogant and cocksure materialist"; "so overconfident and impudent as to speak to the queen"; "the less he knows the more positive he gets"