ETYMOLOGY
? from Old Norse slœ́ða (to drag, trail) (so Norwegian slöda; also, to work carelessly)
EXAMPLE
“…Again, the combination of labourers and Poor people may very much prejudice, besides their slothfull and sleathy slubbering of it, if not exceeding carefully overseen…”
From: The English Improver Improved Or the Survey of Husbandry Surveyed
By Walter Blith, 1652
Lexicophilia 