The audacious firefighter saved the two people in the burning building.
He was an audacious explorer.
He was audacious in his pursuit of the movie star.
Annabelle was so audacious that she called her teacher incompetent int he middle of class.
You could use it anywhere you would use "daring" or "reckless". for example: "He had an audacious plan to swim across the English Channel at night."
Audaciousness is the abstract noun form for the adjective audacious.
The audacious young man decided to climb the tallest mountain in the region with no prior experience.
Walking the tightrope between the two high buildings on a windy day was an audacious stunt.
The man replied rather AUDACIOUSLY. :D
Unrattled.....
Brazen
brazen
I cannot believe you had the audacity to deny me my right to enter the park.When my boyfriend invited me to dinner and had the audacity to ask me to pay, he quickly became my ex-boyfriend.The man had audacity to bungee jump off the building.