"lethargy" in the noun sense
1. lethargy, lassitude, sluggishness
a state of comatose torpor (as found in sleeping sickness)
2. inanition, lassitude, lethargy, slackness
weakness characterized by a lack of vitality or energy
3. languor, lethargy, sluggishness, phlegm, flatness
inactivity showing an unusual lack of energy
"the general appearance of sluggishness alarmed his friends"
Source: WordNet® (An amazing lexical database of English)
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