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Definitions for Invalid

[1] an infirm or sickly person.
[2] a person who is too sick or weak to care for himself or herself: My father was an invalid the last ten years of his life.
[3] Archaic . a member of the armed forces disabled for active service.
[4] unable to care for oneself due to infirmity or disability: his invalid sister.
[5] of or for invalids: invalid diets.
[6] (of things) in poor or weakened condition: the invalid state of his rocking chair.
[7] to affect with disease; make an invalid: He was invalided for life.
[8] to remove from or classify as not able to perform active service, as an invalid.
[9] British . to remove or evacuate (military personnel) from an active theater of operations because of injury or illness.
[10] to become an invalid.
[11] not valid; without force or foundation; indefensible.
[12] deficient in substance or cogency; weak.
[13] void or without legal force, as a contract.
[14] a person suffering from disablement or chronic ill health (as modifier ) an invalid chair
[15] suffering from or disabled by injury, sickness, etc
[16] to cause to become an invalid; disable
[17] (usually foll by out; often passive) mainly British to require (a member of the armed forces) to retire from active service through wounds or illness
[18] not valid; having no cogency or legal force
[19] logic (of an argument) having a conclusion that does not follow from the premises: it may be false when the premises are all true; not valid

Words related to Invalid

baseless, unscientific, untrue, irrational, inoperative, unreasonable, unsound, null, false, void, bad, wrong, peaked, down, debilitated, ill, disabled, sick, frail, ailing

Words nearby Invalid

inv., invade, invaginable, invaginate, invagination, invalid, invalidate, invalidism, invalidity, invalidity benefit, invaluable

Origin of Invalid

21625–35; < Medieval Latin invalidus, Latin: weak; see invalid1

Other words from Invalid

in·val·id·ly , adverb
in·val·id·ness , noun

Word origin for Invalid

C16: from Medieval Latin invalidus without legal force; see invalid 1

Synonyms for Invalid

baseless, false, inoperative, irrational, null, unreasonable, unscientific, unsound, untrue, bad, void, wrong, fallacious, ill-founded, illogical, mad, not binding, not working, nugatory, null and void, reasonless, sophistic, unreasoned