The Collaborative International Dictionary of English v.0.48:
Murkiness \Murk"i*ness\, n. The state of being murky. [1913 Webster]WordNet (r) 3.0 (2006):
murkiness n 1: an atmosphere in which visibility is reduced because of a cloud of some substance [syn: fog, fogginess, murk, murkiness] 2: the quality of being cloudy [syn: cloudiness, murkiness, muddiness]