invalid

invalid
    adj 1: having no cogency or legal force; "invalid reasoning";
           "an invalid driver's license" [ant: {valid}]
    2: no longer valid; "the license is invalid"
    n 1: someone who is incapacitated by a chronic illness or injury
         [syn: {invalid}, {shut-in}]
    v 1: force to retire, remove from active duty, as of firemen
    2: injure permanently; "He was disabled in a car accident" [syn:
       {disable}, {invalid}, {incapacitate}, {handicap}]
    

Invalid \In*val"id\, a. [Pref. in- not + valid: cf. F. invalide,
   L. invalidus infirm, weak. Cf. {Invalid} infirm.]
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   1. Of no force, weight, or cogency; not valid; weak.
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   2. (Law) Having no force, effect, or efficacy; void; null;
      as, an invalid contract or agreement.
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Invalid \In"va*lid\ (?; 277), n. [F. invalide, n. & a., L.
   invalidus, a. See {Invalid} null.]
   A person who is weak and infirm; one who is disabled for
   active service; especially, one in chronic ill health who is
   unable to care for himself.
   [1913 Webster]
    

Invalid \In"va*lid\, a. [See {Invalid}, n.]
   Not well; feeble; infirm; sickly; as, he had an invalid
   daughter.
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Invalid \In"va*lid\, v. t.
   1. To make or render invalid or infirm. "Invalided, bent, and
      almost blind." --Dickens.
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   2. To classify or enroll as an invalid.
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            Peace coming, he was invalided on half pay.
                                                  --Carlyle.
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INVALID. In a physical sense, it is that which is wanting force; in a 
figurative sense, it signifies that which has no effect. 
    

194 Moby Thesaurus words for "invalid":
      Diogenes, Hieronymian, Hieronymite, Timon of Athens, absonant,
      afflict, ailing, anchoress, anchorite, annulled, apoplectic,
      arthritic, ascetic, bad, barren, bedridden invalid, black,
      blank cartridge, bootless, cachectic, case, castrato,
      cloistered monk, closet cynic, consumptive, contradictory,
      contrary to reason, counterproductive, criminal, cripple,
      debilitate, debilitated, derange, desert fathers, desert saints,
      devitalize, disable, disabled, disorder, drained, dud, dyspeptic,
      effete, empty, enervate, enervated, enfeeble, epileptic, eremite,
      erroneous, etiolated, eunuch, evil, exhausted, failing, fallacious,
      false, fatuitous, fatuous, faulty, feckless, feeble, flawed, frail,
      fruitless, futile, gelding, healthless, hermit, hermitess,
      homebody, hospitalize, ill, illogical, impaired, imperfect,
      impotent, improper, in poor health, inaccurate, inadequate, inane,
      inauspicious, inauthentic, incapacitate, incompetent, inconclusive,
      incongruous, inconsequent, inconsequential, inconsistent,
      incorrect, incurable, indispose, ineffective, ineffectual,
      inefficacious, inexpedient, inferior, infirm, inoperative,
      inpatient, irrational, isolationist, languishing, lay up, loner,
      loose, mad, malevolent, marabout, moribund, nonrational,
      nonscientific, not following, nugacious, nugatory, null and void,
      of no force, outcast, outpatient, pale, paralogical, pariah,
      patient, peaked, peaky, peccant, pillar saint, pillarist,
      reasonless, recluse, reduce, reduced, reduced in health, repealed,
      repudiated, revoked, rheumatic, run-down, seclusionist,
      self-annulling, self-contradictory, self-refuting, senseless,
      shut-in, sick, sick person, sicken, sickly, sinful, sinister,
      solitaire, solitary, solitudinarian, sophistic, spastic, spurious,
      stay-at-home, sterile, stylite, sufferer, terminal case, the sick,
      unauthentic, unavailing, unconnected, unfavorable, unhealthy,
      unkind, unphilosophical, unpleasant, unreasonable, unscientific,
      unskillful, unsound, untenable, untoward, untrue, useless, vain,
      valetudinarian, valetudinary, vicious, victim, void, weaken,
      weakened, weakling, weakly, wicked, with low resistance,
      without reason, wrong