'Lethargy' definitions:

Definition of 'lethargy'

From: WordNet
noun
A state of comatose torpor (as found in sleeping sickness) [syn: lethargy, lassitude, sluggishness]
noun
Weakness characterized by a lack of vitality or energy [syn: inanition, lassitude, lethargy, slackness]
noun
Inactivity; showing an unusual lack of energy; "the general appearance of sluggishness alarmed his friends" [syn: languor, lethargy, sluggishness, phlegm, flatness]

Definition of 'Lethargy'

From: GCIDE
  • Lethargy \Leth"ar*gy\ (-j[y^]), n.; pl. -gies (-j[i^]z). [F. l['e]thargie, L. lethargia, Gr. lhqargi`a, fr. lh`qargos forgetful, fr. lh`qh forgetfulness. See Lethe.]
  • 1. Morbid drowsiness; continued or profound sleep, from which a person can scarcely be awaked. [1913 Webster]
  • 2. A state of inaction or indifference. [1913 Webster]
  • Europe lay then under a deep lethargy. --Atterbury. [1913 Webster]

Definition of 'Lethargy'

From: GCIDE
  • Lethargy \Leth"ar*gy\, v. t. To lethargize. [Obs.] --Shak. [1913 Webster]

Synonyms of 'lethargy'

From: Moby Thesaurus