Etymology
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lethargy (n.)

late 14c., litarge, "state of prolonged torpor or inactivity, inertness of body or mind," from Medieval Latin litargia, from Late Latin lethargia, from Greek lēthargia "forgetfulness," from lēthargos "forgetful," apparently etymologically "inactive through forgetfulness," from lēthē "a forgetting, forgetfulness" (see latent) + argos "idle" (see argon). The form with -th- is from 1590s in English. The Medieval Latin word also is the source of Old French litargie (Modern French léthargie), Spanish and Italian letargia.

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Definitions of lethargy

lethargy (n.)
a state of comatose torpor (as found in sleeping sickness);
Synonyms: lassitude / sluggishness
lethargy (n.)
weakness characterized by a lack of vitality or energy;
lethargy (n.)
inactivity; showing an unusual lack of energy;
Synonyms: languor / sluggishness / phlegm / flatness
From wordnet.princeton.edu