| a. | 1. | |
| 1. | Of no force, weight, or cogency; not valid; weak. | |
| 2. | (Law) Having no force, effect, or efficacy; void; null; | |
| n. | 1. | 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. |
| a. | 1. | Not well; feeble; infirm; sickly; |
| v. t. | 1. | To make or render invalid or infirm. |
| 2. | To classify or enroll as an invalid. |
| Noun | 1. | invalid - someone who is incapacitated by a chronic illness or injury Synonyms: shut-in |
| Verb | 1. | invalid - force to retire, remove from active duty, as of firemen |
| 2. | invalid - injure permanently; "He was disabled in a car accident" | |
| Adj. | 1. | invalid - having no cogency or legal force; "invalid reasoning"; "an invalid driver's license" Antonyms: valid - well grounded in logic or truth or having legal force; "a valid inference"; "a valid argument"; "a valid contract"; "a valid license" |
| 2. | invalid - no longer valid; "the license is invalid" |
INVALID. In a physical sense, it is that which is wanting force; in a figurative sense, it signifies that which has no effect.
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