listless (adj.)

• aloof
• anemic
• apathetic
• asthenic
• ataractic
• benumbed
• blase
• bloodless
• bored
• careless
• casual
• chicken
• comatose
• cool
• cowardly
• dead
• debilitated
• detached
• devil-may-care
• disinterested
• dispassionate
• distant
• dopey
• dormant
• drooping
• droopy
• drugged
• dull
• easygoing
• effete
• enervated
• etiolated
• exanimate
• faint
• feeble
• flabby
• flaccid
• floppy
• gone
• gutless
• heartless
• heavy
• heedless
• hopeless
• imbecile
• impassive
• impotent
• inanimate
• inattentive
• incurious
• indifferent
• inert
• insouciant
• jaded
• lackadaisical
• languid
• languorous
• leaden
• lethargic
• lifeless
• limber
• limp
• lukewarm
• lumpish
• mindless
• moribund
• negligent
• nerveless
• nonchalant
• numb
• numbed
• passive
• perfunctory
• phlegmatic
• powerless
• reckless
• regardless
• rubbery
• sapless
• sated
• slack
• sleepy
• slow
• sluggish
• soft
• somnolent
• soporific
• spent
• spineless
• spiritless
• stagnant
• stoic
• stolid
• stupefied
• supine
• tepid
• thoughtless
• torpid
• uncaring
• unconcerned
• undiscriminating
• unemotional
• unenthusiastic
• unhardened
• uninquiring
• uninterested
• uninvolved
• unmindful
• unnerved
• unstrung
• vegetative
• wan
• weak
• weakly
• weary
• withdrawn
• world-weary