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7 definitions found
 for Invalid
From The Collaborative International Dictionary of English v.0.48 :

  Invalid \In*val"id\, a. [Pref. in- not + valid: cf. F. invalide,
     L. invalidus infirm, weak. Cf. Invalid infirm.]
     [1913 Webster]
     1. Of no force, weight, or cogency; not valid; weak.
        [1913 Webster]
  
     2. (Law) Having no force, effect, or efficacy; void; null;
        as, an invalid contract or agreement.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  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]

From The Collaborative International Dictionary of English v.0.48 :

  Invalid \In"va*lid\, a. [See Invalid, n.]
     Not well; feeble; infirm; sickly; as, he had an invalid
     daughter.
     [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Invalid \In"va*lid\, v. t.
     1. To make or render invalid or infirm. "Invalided, bent, and
        almost blind." --Dickens.
        [1913 Webster]
  
     2. To classify or enroll as an invalid.
        [1913 Webster]
  
              Peace coming, he was invalided on half pay.
                                                    --Carlyle.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  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      2: no longer valid; "the license is invalid"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]

From Moby Thesaurus II by Grady Ward, 1.0 :

  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
  
  

From Bouvier's Law Dictionary, Revised 6th Ed (1856) :

  INVALID. In a physical sense, it is that which is wanting force; in a 
  figurative sense, it signifies that which has no effect. 
  
  

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