invalid (n.)
- ailing
- anchorite
- arthritic
- ascetic
- bad
- barren
- black
- case
- castrato
- consumptive
- contradictory
- criminal
- cripple
- disabled
- disorder
- dud
- dyspeptic
- empty
- epileptic
- eremite
- eunuch
- evil
- failing
- frail
- gelding
- hermit
- homebody
- ill
- imperfect
- incompetent
- incurable
- inferior
- inpatient
- irrational
- isolationist
- loner
- mad
- marabout
- outcast
- outpatient
- pale
- pariah
- patient
- recluse
- rheumatic
- shut-in
- sick
- sinful
- sinister
- solitaire
- solitary
- solitudinarian
- spastic
- stay-at-home
- stylite
- sufferer
- vain
- valetudinarian
- victim
- void
- weakling
- wrong
invalid (v.)
invalid (adj.)
- ailing
- apoplectic
- arthritic
- ascetic
- bad
- barren
- black
- bootless
- cachectic
- case
- consumptive
- contradictory
- counterproductive
- criminal
- debilitated
- disabled
- drained
- dud
- dyspeptic
- effete
- empty
- enervated
- epileptic
- erroneous
- etiolated
- evil
- exhausted
- failing
- fallacious
- false
- fatuous
- faulty
- feckless
- feeble
- flawed
- frail
- fruitless
- futile
- ill
- illogical
- impaired
- imperfect
- impotent
- improper
- inaccurate
- inadequate
- inane
- inauspicious
- inauthentic
- incompetent
- inconclusive
- incongruous
- inconsequent
- inconsequential
- inconsistent
- incorrect
- incurable
- ineffective
- ineffectual
- inefficacious
- inexpedient
- inferior
- infirm
- inoperative
- irrational
- isolationist
- loose
- mad
- malevolent
- moribund
- nonrational
- nugatory
- outcast
- pale
- patient
- peaked
- peaky
- peccant
- reasonless
- recluse
- reduced
- rheumatic
- run-down
- self-contradictory
- senseless
- shut-in
- sick
- sickly
- sinful
- sinister
- solitary
- sophistic
- spastic
- spurious
- stay-at-home
- sterile
- unauthentic
- unavailing
- unconnected
- unfavorable
- unhealthy
- unkind
- unpleasant
- unreasonable
- unscientific
- unskillful
- unsound
- untenable
- untoward
- untrue
- useless
- vain
- valetudinarian
- valetudinary
- vicious
- void
- weakened
- weakly
- wicked
- wrong
