listlessness (n.)

• acedia
• adynamia
• aloofness
• anemia
• apathy
• ataraxia
• atony
• blah
• blahs
• boredom
• cachexia
• cachexy
• carelessness
• casualness
• comatoseness
• cowardice
• debilitation
• debility
• detachment
• disinterest
• disinterestedness
• dispassion
• disregard
• drowsiness
• dullness
• easygoingness
• enervation
• ennui
• etiolation
• faintness
• fatigue
• feebleness
• flabbiness
• flaccidity
• heartlessness
• heaviness
• hebetude
• heedlessness
• hopelessness
• impassiveness
• impassivity
• impotence
• inattention
• indifference
• insouciance
• languor
• lassitude
• lenitude
• lethargy
• lifelessness
• mindlessness
• negligence
• nonchalance
• numbness
• oscitancy
• passiveness
• passivity
• phlegm
• prostration
• recklessness
• resignation
• sleepiness
• sloth
• slothfulness
• slowness
• sluggishness
• softness
• somnolence
• sopor
• spiritlessness
• stolidity
• stupefaction
• stupor
• torpidity
• torpidness
• torpor
• unconcern
• unmindfulness
• weakness
• weariness
• withdrawal
• withdrawnness
• world-weariness