1. (n.) Lack of energy; listlessness\; a state of the body or mind which is caused by exhaustion of strength and characterized by a languid feeling; feebleness; lassitude; laxity.

2. (n.) Any enfeebling disease.

3. (n.) Listless indolence; dreaminess. Pope.

abeyance acedia adynamia anemia apathy atony blah feeling bloodlessness blues boredom brain fag cachexia cachexy catalepsy catatonia cautiousness circumspection coma cowardice creeping deadliness deathliness debilitation debility deliberateness deliberation depression doldrums dormancy doziness drawl drowsiness dullness dumps enervation enfeeblement ennui entropy etiolation exhaustion eyestrain faintness fatigue feebleness flabbiness flaccidity foot-dragging goneness heart strain heaviness hebetude idleness impotence inanimation indifference indolence inertia inertness jadedness lackadaisicalness languidness languishment languorousness lassitude latency laziness leisureliness lenitude lentitude lentor lethargy lifelessness listlessness lotus-eating mental fatigue mental strain oscitancy oscitation overstrain overtiredness pandiculation passiveness passivity phlegm pokiness prostration reluctance satedness slackness sleep sleepiness sloth slothfulness slowness sluggardy sluggishness slumber softness somnolence somnolency stagnancy stagnation stance fatigue stasis strain strengthlessness stretching stupefaction stupor supineness suspense tedium tentativeness tiredness torpidity torpidness torpitude torpor vegetation vis inertiae weakliness weakness wearifulness weariness world-weariness yawning