What is the word family for lethargy?

The Word family for "lethargy" includes related terms such as "lethargic," which describes a state of sluggishness or lack of energy, and "lethargically," an adverb that describes performing actions in a slow or sluggish manner. Other related Words may include "lethargist," referring to someone who exhibits lethargy, and "lethargize," which means to make lethargic or to induce lethargy. These Words all share a common root related to the concept of inactivity or fatigue.