acedia, apathy, boredom, brain fag, debilitation, debility, drowsiness, dullness, enervation, enfeeblement, ennui, eyestrain, faintness, fatigue, goneness, heart strain, heaviness, hebetude, inanimation, indifference, jadedness, lackadaisicalness, languidness, languishment, languor, languorousness, lassitude, lenitude, lentor, lethargy, lifelessness, listlessness, mental fatigue, mental strain, oscitancy, overstrain, overtiredness, passivity, phlegm, satedness, sloth, slothfulness, slowness, sluggishness, somnolence, stance fatigue, strain, stupefaction, stupor, supineness, tiredness, torpidity, torpidness, torpitude, torpor, weakness, wearifulness, weariness, world-weariness