He was an audacious explorer.
He was audacious in his pursuit of the movie star.
The audacious explorer decided to summit the treacherous mountain peak alone, despite the warnings of dangerous weather conditions.
She had the audacious idea to start her own business with nothing but a vision and determination.
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.
The audacious cat climbed to the very top of the tree to chase a bird.
The man replied rather AUDACIOUSLY. :D
Brazen
brazen
Unrattled.....
Audacious derives from the Latin word audax, meaning "brave, daring". When declined, this Latin adjective took the form audac-.Audacious has been in the English language since at least 1550. Audacity dates back to at least 1450.