1.  Extremely bold or daring; recklessly brave; fearless: an audacious explorer.
2.  Extremely original; without restriction to prior ideas; highly inventive: an audacious vision of the city’s bright future.
3.  Recklessly bold in defiance of convention, propriety, law, or the like; insolent; brazen.
4.  Lively; unrestrained; uninhibited: an audacious interpretation of her role.