The Collaborative International Dictionary of English v.0.48:
Slatternliness \Slat"tern*li*ness\, n. The quality or state of being slatternly; slovenliness; untidiness. [1913 Webster]WordNet (r) 3.0 (2006):
slatternliness n 1: in the manner of a slattern [syn: slatternliness, sluttishness]