The Collaborative International Dictionary of English v.0.48:
Faultiness \Fault"i*ness\, n. Quality or state of being faulty. [1913 Webster] Round, even to faultiness. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
faultiness n 1: the state of being defective [syn: defectiveness, faultiness]