Synonyms and related words :
acedia, apathy, boredom, doziness, dullness, enervation, ennui, fatigue, heaviness, hebetude, inanimation, indifference, jadedness, lackadaisicalness, languidness, languishment, languor, languorousness, lassitude, lenitude, lentor, lethargy, lifelessness, listlessness, oscitancy, oscitation, pandiculation, passivity, phlegm, satedness, sleepiness, sloth, slothfulness, slowness, sluggishness, somnolence, somnolency, stretching, stupefaction, stupor, supineness, torpidity, torpidness, torpitude, torpor, weariness, world-weariness, yawning,