invalid

1 of 4

adjective (1)

in·val·id (ˌ)in-ˈva-ləd

Synonyms of invalid next

: not valid:

: being without foundation or force in fact, truth, or law

an invalid assumption

declared the will invalid

: logically inconsequent

invalidly

(ˌ)in-ˈva-ləd-lē

adverb

invalid

2 of 4

noun

in·va·lid ˈin-və-ləd

British usually -ˌlēd

: one who is sickly or disabled

invalid

3 of 4

verb

in·va·lid ˈin-və-ləd

-ˌlid,

British usually -ˌlēd,

or ˌin-və-ˈlēd

invalided; invaliding; invalids

transitive verb

: to remove from active duty by reason of sickness or disability

: to make sickly or disabled

invalid

4 of 4

adjective (2)

in·va·lid ˈin-və-ləd

British usually -ˌlēd

: affected by disease or disability : sickly

: of, relating to, or suited to one that is sick

an invalid chair

Examples of invalid in a Sentence

Adjective (1) the treaty is invalid once one side violates it that's an invalid assumption on your part an argument which has one untrue premise is invalid an invalid claim that can be easily disproved by the facts Noun Her husband has become an invalid. Adjective (2) an old and now invalid woman who rarely gets out anymore

Recent Examples on the Web

Adjective

Ryba ruled the nominating petition submitted by Kennedy and running-mate Nicole Shanahan is invalid because of the false residency claim and ordered the New York State Board of Elections not to place the Kennedy-Shanahan ticket on the 2024 ballot. —

Joey Garrison, USA TODAY, 13 Aug. 2024 Yet after all this, the PTAB recently examined the ‘912 patent again and somehow found the patent invalid, ignoring 14 years of precedential rulings of its own parent agency as well as those of the federal courts. —

Chuck Hong, Fortune, 9 Aug. 2024

Noun

Concern grew that the fabulous invalid, as the theater has long been dubbed, might be down for the count. —

Charles McNulty, Los Angeles Times, 4 Dec. 2023 As these invalids made their way to Portsmouth, nearly half slipped away, including one who hobbled off on a wooden leg. —

David Grann, The New Yorker, 28 Feb. 2023 See all Example Sentences for invalid

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'invalid.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

Adjective (1)

Latin invalidus weak, from in- + validus strong — more at valid

Adjective (2)

Latin & French; French invalide, from Latin invalidus

First Known Use

Adjective (1)

1542, in the meaning defined above

Noun

1701, in the meaning defined above

Verb

1787, in the meaning defined at sense 1

Adjective (2)

1642, in the meaning defined at sense 1

Time Traveler

The first known use of invalid was in 1542

See more words from the same year

Cite this Entry

Style

“Invalid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invalid. Accessed 15 Sep. 2024.

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Kids Definition

invalid

1 of 4 adjective

in·val·id (ˈ)in-ˈval-əd

: having no force or effect : not valid

an invalid parking sticker

an invalid assumption

invalidity

ˌin-və-ˈlid-ət-ē

noun

invalidly

(ˈ)in-ˈval-əd-lē

adverb

invalid

2 of 4 adjective

in·va·lid ˈin-və-ləd

: suffering from disease or disability : sickly

: of, relating to, or suited to an invalid

invalid

3 of 4 noun

like ²

: one who is sickly or disabled

invalid

4 of 4 verb

in·va·lid ˈin-və-ləd

-ˌlid

: to make sickly or disabled

Etymology

Adjective

from earlier invalid "not having a sound basis in fact or reason, not valid," from Latin invalidus "weak"

Adjective

from French invalide "suffering from a disease, sickly," from Latin invalidus "weak"

Medical Definition

invalid

1 of 3 adjective

in·va·lid

ˈin-və-ləd, British usually -ˌlēd

: affected by disease or disability : sickly

: of, relating to, or suited to one that is sick

an invalid chair

invalid

2 of 3 noun

: one who is sickly or disabled

invalid

3 of 3 transitive verb

in·va·lid

ˈin-və-ləd, -ˌlid, British usually -ˌlēd or ˌin-və-ˈlēd

: to remove from active duty by reason of sickness or disability

was invalided out of the army

: to make sickly or disabled

a patient invalided by valvular disease

Legal Definition

invalid

adjective

in·val·id in-ˈva-ləd

: being without force or effect under the law

declared the will invalid

invalidly adverb

Last Updated: 23 Aug 2024 - Updated example sentences

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invalid

adjective (1)

noun

verb

adjective (2)

Synonyms

Examples of invalid in a Sentence

Word History

Dictionary Entries Near invalid

Cite this Entry

Kids Definition

Medical Definition

Legal Definition