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Noun: murkiness  mur-kee-nus
  1. An atmosphere in which visibility is reduced because of a cloud of some substance
    "The murkiness of the foggy night made driving dangerous";
    - fog, fogginess, murk, mirk [archaic]
     
  2. The quality of being cloudy
    "The murkiness of the fog reduced visibility";
    - cloudiness, muddiness

Type of: atmosphere, atmospheric state, opacity, opaqueness