'audaciousness' originates from English, specifically formed from the adjective 'audacious' plus the noun-forming suffix '-ness'.

'audacious' came into English via Old French/Anglo-Norman (e.g. 'audacieux') and ultimately from Latin 'audax' (genitive 'audacis'), where the root 'aud-' (from Latin 'audēre') meant 'to dare'.

Initially related to the idea of 'daring' or 'bold' action, the formation 'audaciousness' developed to denote the quality or state of being audacious and has come to carry both positive (courageous daring) and negative (presumptuous impudence) connotations.