Cocksure
[adj] 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"
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arrogant, assured, certain, confident, convinced, decided, determined, hubristic, overconfident, oversure, overweening, persuaded, poised, pompous, positive, proud, reassured, secure, self-assured, self-confident, self-important, self-reliant, sure, unafr