Webster’s Revised Unabridged Dictionary · 1913
Curiousness
Cu′ri·ous·ness, n. 1. Carefulness; painstaking. [Obs.]
My father's care With curiousness and cost did train me up. Massinger.
2. The state of being curious; exactness of workmanship; ingenuity of contrivance.
3. Inquisitiveness; curiosity.