Overconfident
[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, audacious, brash, brazen, brazenfaced, cocksure, cocky, confident, convinced, decided, determined, foolhardy, hasty, heedless, hubristic, improvident, imprudent, impudent, incautious, indiscreet, injudicious, insolent, overbearing, over