The Collaborative International Dictionary of English v.0.48:
Ingeniousness \In*gen"ious*ness\, n. The quality or state of being ingenious; ingenuity. IngeniteWordNet (r) 3.0 (2006):
ingeniousness n 1: the power of creative imagination [syn: inventiveness, ingeniousness, ingenuity, cleverness] 2: the property of being ingenious; "a plot of great ingenuity"; "the cleverness of its design" [syn: ingenuity, ingeniousness, cleverness]