lethargy
1. [ noun ] (medicine) a state of comatose torpor (as found in sleeping sickness)
Synonyms: sluggishness lassitude
Related terms: torpor hebetude
2. [ noun ] weakness characterized by a lack of vitality or energy
Synonyms: lassitude inanition
Related terms: weakness
3. [ noun ] inactivity; showing an unusual lack of energy
Synonyms: sluggishness phlegm languor
Related terms: inactiveness
Similar spelling:   lethargic