in·val·id
(ˌ)in-ˈva-ləd 
: not valid:
a
: being without foundation or force in fact, truth, or law
an invalid assumption
declared the will invalid
b
: logically inconsequent
in·va·lid
ˈin-və-ləd
British usually -ˌlēd
: one who is sickly or disabled
in·va·lid
ˈin-və-ləd
-ˌlid,
British usually -ˌlēd,
or ˌin-və-ˈlēd
invalided; invaliding; invalids
1
: to remove from active duty by reason of sickness or disability
2
: to make sickly or disabled
in·va·lid
ˈin-və-ləd
British usually -ˌlēd
1
: affected by disease or disability : sickly
2
: of, relating to, or suited to one that is sick
an invalid chair
Synonyms
Adjective (1)
Adjective (2)
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
Samuel Burke, Fortune, 29 Oct. 2024
Failure to comply with these requirements renders the mail ballot invalid.
—Melissa Quinn, CBS News, 28 Oct. 2024
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 
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Adjective
His legal team had argued that the congressional subpoena was invalid because Trump had asserted executive privilege.
—Samuel Burke, Fortune, 29 Oct. 2024
Failure to comply with these requirements renders the mail ballot invalid.
—Melissa Quinn, CBS News, 28 Oct. 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
Dictionary Entries Near invalid
Cite this Entry
“Invalid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/invalid. Accessed 22 Nov. 2024.
Copy CitationKids 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
noun
ˌin-və-ˈlid-ət-ē
invalid
2 of 4 adjective
in·va·lid
ˈin-və-ləd
1
: suffering from disease or disability : sickly
2
: of, relating to, or suited to an invalid
invalid
3 of 4 nounlike 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"
Legal Definition
invalid
adjective
in·val·id
in-ˈva-ləd
: being without force or effect under the law
declared the will invalid
invalidly
adverb
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