lethargy lethargy /ˈlɛθɝdʒi/

noun

1. () A state of comatose torpor (as found in sleeping sickness)  ( lassitude , sluggishness , lethargy )
   a state of comatose torpor (as found in sleeping sickness)
   
2. () Weakness characterized by a lack of vitality or energy  ( inanition , lassitude , slackness , lethargy )
   weakness characterized by a lack of vitality or energy
   
3. Inactivity; showing an unusual lack of energy  ( flatness , languor , lethargy , phlegm , sluggishness )
   inactivity; showing an unusual lack of energy
    The general appearance of sluggishness alarmed his friends
   the general appearance of sluggishness alarmed his friends