(a.) Confident to excess.

arrogant assured audacious brash brazen brazenfaced cocksure cocky confident convinced decided determined foolhardy hasty heedless hubristic improvident imprudent impudent incautious indiscreet injudicious insolent overbearing overbold overcareless oversure overweening persuaded poised pompous positive presuming proud pushful pushy rash reassured secure self-assertive self-assured self-confident self-important self-reliant short-sighted sure swaggering temerarious thoughtless unafraid unchary undoubting unfaltering unhesitating unwary unwavering uppity vainglorious