From The Collaborative International Dictionary of English v.0.48 :
Audaciousness \Au*da"cious*ness\, n.
The quality of being audacious; impudence; audacity.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
audaciousness
n 1: fearless daring [syn: audacity, audaciousness,
temerity]
2: aggressive boldness or unmitigated effrontery; "he had the
audacity to question my decision" [syn: audacity,
audaciousness]