invalid

• POS: Adjective, Noun, Verb (transitive)
• HYPHEN: in=val=id

CIDE DICTIONARY

invalid, a. [Pref. in- not + valid: cf. F. invalide, L. invalidus infirm, weak. Cf. Invalid infirm.].

•  Of no force, weight, or cogency; not valid; weak.  [1913 Webster]
•  Having no force, effect, or efficacy; void; null; as, an invalid contract or agreement.  [1913 Webster]

invalid, 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, a. [See Invalid, n.].

 Not well; feeble; infirm; sickly; as, he had an invalid daughter.  [1913 Webster]

invalid, v. t. 

•  To make or render invalid or infirm.  Dickens.  [1913 Webster]
•  To classify or enroll as an invalid.  [1913 Webster]

  "Peace coming, he was invalided on half pay."  [1913 Webster]

OXFORD DICTIONARY

invalid, n. & v.
--n.
1 a person enfeebled or disabled by illness or injury.
2 (attrib.) a of or for invalids (invalid car; invalid diet). b being an invalid (caring for her invalid mother).
--v. (invalided, invaliding)
1 tr. (often foll. by out etc.) remove from active service (one who has become an invalid).
2 tr. (usu. in passive) disable (a person) by illness.
3 intr. become an invalid.

Derivative

invalidism n.

invalid, adj. not valid, esp. having no legal force.

Derivative

invalidly adv.

Etymology

L invalidus (as INVALID(1))

THESAURUS

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

ROGET THESAURUS

invalid

Disease

N disease, illness, sickness, ailing, all the ills that flesh is heir to, morbidity, morbosity, infirmity, ailment, indisposition, complaint, disorder, malady, distemper, distemperature, visitation, attack, seizure, stroke, fit, delicacy, loss of health, invalidation, cachexy, cachexia, atrophy, marasmus, indigestion, dyspepsia, decay, decline, consumption, palsy, paralysis, prostration, taint, pollution, infection, sepsis, septicity, infestation, epidemic, pandemic, endemic, epizootic, murrain, plague, pestilence, pox, sore, ulcer, abscess, fester, boil, pimple, wen, carbuncle, gathering, imposthume, peccant humor, issue, rot, canker, cold sore, fever sore, cancer, carcinoma, leukemia, neoplastic disease, malignancy, tumor, caries, mortification, corruption, gangrene, sphacelus, sphacelation, leprosy, eruption, rash, breaking out, fever, temperature, calenture, inflammation, ague, angina pectoris, appendicitis, Asiatic cholera, spasmodic cholera, biliary calculus, kidney stone, black death, bubonic plague, pneumonic plague, blennorrhagia, blennorrhoea, blood poisoning, bloodstroke, bloody flux, brash, breakbone fever, dengue fever, malarial fever, Q-fever, heart attack, cardiac arrest, cardiomyopathy, hardening of the arteries, arteriosclerosis, atherosclerosis, bronchocele, canker rash, cardialgia, carditis, endocarditis, cholera, asphyxia, chlorosis, chorea, cynanche, dartre, enanthem, enanthema, erysipelas, exanthem, exanthema, gallstone, goiter, gonorrhea, green sickness, grip, grippe, influenza, flu, hay fever, heartburn, heaves, rupture, hernia, hemorrhoids, piles, herpes, itch, king's evil, lockjaw, measles, mumps, polio, necrosis, pertussis, phthisis, pneumonia, psora, pyaemia, pyrosis, quinsy, rachitis, ringworm, rubeola, St. Vitus's dance, scabies, scarlatina, scarlet fever, scrofula, seasickness, struma, syntexis, tetanus, tetter, tonsillitis, tonsilitis, tracheocele, trachoma, trismus, varicella, varicosis, variola, water qualm, whooping cough, yellow fever, yellow jack, fatal disease, dangerous illness, galloping consumption, churchyard cough, general breaking up, break up of the system, idiocy insanity, martyr to disease, cripple, the halt the lame and the blind, valetudinary, valetudinarian, invalid, patient, case, sickroom, sick- chamber, pathology, etiology, nosology, anthrax, bighead, blackleg, blackquarter, cattle plague, glanders, mange, scrapie, milk sickness, heartworm, feline leukemia, roundworms, quarter-evil, quarter-ill, rinderpest, virus, bacterium, bacteria, DNA virus, RNA virus, rhinovirus, rhabdovirus, picornavirus, herpesvirus, cytomegalovirus, CMV, human immunodefficiency virus, HIV, diseased, ailing, ill, ill of, taken ill, seized with, indisposed, unwell, sick, squeamish, poorly, seedy, affected with illness, afflicted with illness, laid up, confined, bedridden, invalided, in hospital, on the sick list, out of health, out of sorts, under the weather, valetudinary, unsound, unhealthy, sickly, morbid, morbose, healthless, infirm, chlorotic, unbraced, drooping, flagging, lame, crippled, halting, morbid, tainted, vitiated, peccant, contaminated, poisoned, tabid, mangy, leprous, cankered, rotten, rotten to the core, rotten at the core, withered, palsied, paralytic, dyspeptic, luetic, pneumonic, pulmonic, phthisic, rachitic, syntectic, syntectical, tabetic, varicose, touched in the wind, broken-winded, spavined, gasping, hors de combat, weakly, weakened, decrepit, decayed, incurable, in declining health, cranky, in a bad way, in danger, prostrate, moribund, morbific epidemic, endemic, zymotic.

Illegality

N illegality, lawlessness, illicitness, breach of law, violation of law, infraction of the law, disobedience, unconformity, arbitrariness, antinomy, violence, brute force, despotism, outlawry, mob law, lynch law, club law, Lydford law, martial law, drumhead law, coup d'etat, le droit du plus fort, argumentum baculinum, illegality, informality, unlawfulness, illegitimacy, bar sinister, trover and conversion, smuggling, poaching, simony, outlaw, bad man, v, offend against the law, violate the law, infringe the law, break the law, set the law at defiance, ride roughshod over, drive a coach and six through a statute, ignore the law, make the law a dead letter, take the law into one's own hands, smuggle, run, poach, illegal, unlawful, illegitimate, not allowed, prohibited, illicit, contraband, actionable, unwarranted, unwarrantable, unauthorized, informal, unofficial, injudicial, extrajudicial, lawless, arbitrary, despotic, despotical, corrupt, summary, irresponsible, unanswerable, unaccountable, expired, invalid, unchartered, unconstitutional, null and void, a dead letter, lawless, unregulated, illegally, with a high hand, in violation of law.

& Sophistry

N intuition, instinct, association, hunch, gut feeling, presentiment, premonition, rule of thumb, superstition, astrology, faith (supposition), sophistry, paralogy, perversion, casuistry, jesuitry, equivocation, evasion, chicane, chicanery, quiddet, quiddity, mystification, special pleading, speciousness, nonsense, word sense, tongue sense, false reasoning, vicious reasoning, circular reasoning, petitio principii, ignoratio elenchi, post hoc ergo propter hoc, non sequitur, ignotum per ignotius, misjudgment, false teaching, sophism, solecism, paralogism, quibble, quirk, elenchus, elench, fallacy, quodlibet, subterfuge, subtlety, quillet, inconsistency, antilogy, a delusion, a mockery, and a snare, claptrap, cant, mere words, lame and impotent conclusion, meshes of sophistry, cobwebs of sophistry, flaw in an argument, weak point, bad case, overrefinement, hairsplitting, intuitive, instinctive, impulsive, independent of reason, anterior to reason, gratuitous, hazarded, unconnected, unreasonable, illogical, false, unsound, invalid, unwarranted, not following, inconsequent, inconsequential, inconsistent, absonous, absonant, unscientific, untenable, inconclusive, incorrect, fallacious, fallible, groundless, unproved, non sequitur, it does not follow, deceptive, sophistical, jesuitical, illusive, illusory, specious, hollow, plausible, ad captandum, evasive, irrelevant, weak, feeble, poor, flimsy, loose, vague, irrational, nonsensical, foolish, frivolous, pettifogging, quibbling, finespun, overrefined, at the end of one's tether, au bout de son latin, intuitively, by intuition, illogically, non constat, that goes for nothing.