The Collaborative International Dictionary of English v.0.48:
Unacceptability \Un`ac*cept`a*bil"i*ty\, n. The quality of being unacceptable; unacceptableness. [1913 Webster]WordNet (r) 3.0 (2006):
unacceptability n 1: unsatisfactoriness by virtue of not conforming to approved standards [syn: unacceptability, unacceptableness] [ant: acceptability, acceptableness]