lethargy

nouns

a state of comatose torpor (as found in sleeping sickness)
lassitude, lethargy, sluggishness
weakness characterized by a lack of vitality or energy
inanition, lassitude, lethargy, slackness
inactivity; showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
flatness, languor, lethargy, phlegm, sluggishness
is derived from
lethargic