lethargy

noun

1.
a state of comatose torpor (as found in sleeping sickness)
sleepleness zwodder lassitude sluggishness
2.
weakness characterized by a lack of vitality or energy
unlustiness wimpiness inanition lassitude slackness
3.
inactivity; showing an unusual lack of energy
flatness languor phlegm sluggishness
Derived from:
lethargic