Source : Webster's Revised Unabridged Dictionary (1913)

Audaciousness \Au*da"cious*ness\, n.
   The quality of being audacious; impudence; audacity.

Source : WordNet®

audaciousness
     n 1: fearless daring [syn: {audacity}, {temerity}]
     2: aggressive boldness or unmitigated effrontery; "he had the
        audacity to question my decision" [syn: {audacity}]