He was an audacious explorer.
He was audacious in his pursuit of the movie star.
The audacious firefighter saved the two people in the burning building.
Audaciousness is the abstract noun form for the adjective audacious.
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.
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.
Disrespectful, insolent, brash, cheeky, forward, audacious, sassy...
The word is possibly 'bodacious' which is a portmanteau of 'bold' and 'audacious'.