extremely bold or daring; recklessly brave; fearless

an audacious explorer.

extremely original; without restriction to prior ideas; highly inventive

an audacious vision of the city's bright future.

recklessly bold in defiance of convention, propriety, law, or the like; insolent; brazen.

lively; unrestrained; uninhibited

an audacious interpretation of her role.

noun

adventuresomeness , adventurousness , audacity , boldness , daredevilry , daredeviltry , daringness , venturesomeness , venturousness , assumption , brashness , brazenness , cheek , cheekiness , chutzpah , discourtesy , disrespect , effrontery , face , familiarity , forwardness , gall , impertinence , impudency , incivility , insolence , nerve , nerviness , overconfidence , pertness , presumptuousness , pushiness , rudeness , sassiness , sauciness