Lassitude

n.

1.

A condition of the body, or mind, when its voluntary functions are performed with difficulty, and only by a strong exertion of the will; languor; debility; weariness. The corporeal instruments of action being strained to a high pitch . . . will soon feel a lassitude. - Barrow.

Noun	1.	lassitude - a state of comatose torpor (as found in sleeping sickness) Synonyms: lethargy, sluggishness
	2.	lassitude - a feeling of lack of interest or energy Synonyms: listlessness, languor
	3.	lassitude - weakness characterized by a lack of vitality or energy Synonyms: inanition, lethargy

acedia, adynamia, anemia, apathy, atony, blah feeling, bloodlessness, blues, boredom, brain fag, cachexia, cachexy, cowardice, debilitation, debility, depression, disinterest, disregard, doldrums, drowsiness, dullness, dumps, enervation, enfeeblement, ennui, etiolation, exhaustion, eyestrain, faintness, fatigue, feebleness, flabbiness, flaccidity, goneness, heart strain, heaviness, hebetude, heedlessness, impotence, inanimation, indifference, insouciance, jadedness, lackadaisicalness, languidness, languishment, languor, languorousness, lenitude, lentor, lethargy, lifelessness, listlessness, mental fatigue, mental strain, oscitancy, overstrain, overtiredness, passivity, phlegm, powerlessness, prostration, satedness, sleep, sleepiness, sloth, slothfulness, slowness, sluggishness, slumber, softness, somnolence, stance fatigue, strain, strengthlessness, stupefaction, stupor, supineness, tedium, tiredness, torpidity, torpidness, torpitude, torpor, unconcern, unmindfulness, weakliness, weakness, wearifulness, weariness, world-weariness