moribund (adj.)
- apathetic
- bad
- benumbed
- blase
- bored
- cachectic
- dead
- debilitated
- decadent
- dopey
- dormant
- drained
- droopy
- drugged
- dull
- dying
- ending
- enervated
- exanimate
- exhausted
- fading
- failing
- feeble
- frail
- going
- heavy
- hopeless
- inanimate
- inert
- infirm
- invalid
- jaded
- lackadaisical
- languid
- languorous
- leaden
- lethargic
- lifeless
- listless
- low
- lumpish
- nonviable
- numb
- obsolescent
- pale
- peaked
- peaky
- phlegmatic
- reduced
- run-down
- sated
- sickly
- sleepy
- slipping
- slow
- sluggish
- somnolent
- stagnant
- supine
- terminal
- torpid
- unhealthy
- unsound
- valetudinarian
- valetudinary
- vegetative
- wan
- waning
- weak
- weakened
- weakly
- weary
- world-weary