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Lethargy means abnormal drowsiness.
Pancreatitis in cats may cause lethargy.
signs include constant weakness lethargy and paleness. Lethargy is is tired
"Lethargy" comes from "Lethe" the Underworld River of Forgetfulness/Oblivion.
The word "lethargy" does not appear in the book "The Giver" by Lois Lowry.