lethargic (adj.)

• aloof
• apathetic
• benumbed
• blase
• bored
• cataleptic
• comatose
• dead
• debilitated
• detached
• dilatory
• disinterested
• doped
• dopey
• dormant
• dozy
• dreamy
• droopy
• drowsy
• drugged
• dull
• enervated
• exanimate
• exhausted
• faineant
• fatigued
• heartless
• heavy
• hopeless
• idle
• impassive
• inactive
• inanimate
• indifferent
• indolent
• inert
• insouciant
• jaded
• lackadaisical
• laggard
• languid
• languorous
• lazy
• leaden
• lifeless
• listless
• lumpish
• moribund
• napping
• narcoleptic
• narcotized
• nodding
• nonchalant
• numb
• numbed
• oscitant
• passive
• phlegmatic
• sated
• slack
• sleepy
• slothful
• slow
• sluggish
• slumberous
• slumbery
• somnolent
• soporific
• spiritless
• stagnant
• stoic
• stolid
• stretchy
• stupefied
• stupid
• stuporous
• supine
• tired
• torpid
• uncaring
• unconcerned
• uninterested
• vegetative
• wan
• weak
• weary
• withdrawn
• world-weary
• yawning