1. A state of comatose torpor (as found in sleeping sickness)
   - lassitude, sluggishness 
2. Weakness characterized by a lack of vitality or energy
   - inanition, lassitude, slackness 
3. Inactivity; showing an unusual lack of energy
   - languor, sluggishness, phlegm, flatness

Derived forms: lethargies

See also: lethargic

Type of: inactiveness, inactivity, inertia, torpidity, torpor, weakness

Encyclopedia: Lethargy

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