lethargy (n.)

  1. a state of comatose torpor (as found in sleeping sickness)

    [ Syn: lassitude , sluggishness ]

  2. weakness characterized by a lack of vitality or energy

    [ Syn: inanition , lassitude , slackness ]

  3. inactivity; showing an unusual lack of energy; the general appearance of sluggishness alarmed his friends

    [ Syn: languor , sluggishness , phlegm , flatness ]

The dictionary is based on the WordNet Electronic Lexical Database.
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