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