1. Bold, daring, or fearless; especially, in challenging certain assumptions or conventions: "The soldier was an audacious warrior when he fought the enemy in order to save his fellow soldiers."
2. Extremely bold or daring; recklessly brave; fearless: "Her father was an audacious explorer in the Canadian north."
3. Extremely original; without restriction to prior ideas; highly inventive: "The mayoral candidate had an audacious vision of the city's bright future."
4. Recklessly bold in defiance of convention, propriety, law, etc.: "Her audacious behavior during the demonstration resulted in her arrest by the police."
5. Lively; unrestrained; uninhibited: "The actress had an audacious interpretation of her role in the drama."
6. Showing an impudent lack of respect: "The student made an audacious remark to the teacher when he was told to quit talking."
7. Etymology: Formed from Latin audac-, the stem of audax, "bold", from audere, "to dare", from avidus, "eagerness" or "greed for something".