Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

invalid

play
adjective in·val·id \(ˌ)in-ˈva-ləd\

Definition of invalid

  1. :  not valid: a :  being without foundation or force in fact, truth, or law <an invalid assumption> <declared the will invalid> b :  logically inconsequent

invalidly play \-lē\ adverb


Origin of invalid

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


First Known Use: 1542

Rhymes with invalid


2

invalid

play
adjective in·va·lid \ˈin-və-ləd, British usually -ˌlēd\

Definition of invalid

  1. 1 :  suffering from disease or disability :  sickly

  2. 2 :  of, relating to, or suited to one that is sick <an invalid chair>



Origin of invalid

Latin & French; French invalide, from Latin invalidus


First Known Use: 1642


3

invalid

play
noun in·val·id \same as 2\

Simple Definition of invalid

  • : a person who needs to be cared for because of injury or illness

Source: Merriam-Webster's Learner's Dictionary

Full Definition of invalid

  1. :  one who is sickly or disabled

Examples of invalid in a sentence

  1. Her husband has become an invalid.



1701

First Known Use of invalid

1701


4

invalid

play
verb in·va·lid \ˈin-və-ləd, -ˌlid, British usually -ˌlēd or ˌin-və-ˈlēd\

Simple Definition of invalid

  • : to release (someone) from active military service because of illness or injury

Source: Merriam-Webster's Learner's Dictionary

Full Definition of invalid

  1. transitive verb
  2. 1 :  to remove from active duty by reason of sickness or disability

  3. 2 :  to make sickly or disabled

1787

First Known Use of invalid

1787


INVALID Defined for Kids

1

invalid

play
adjective in·val·id \in-ˈva-ləd\

Definition of invalid for Students

  1. :  having no force or effect




2

invalid

play
noun in·va·lid \ˈin-və-ləd\

Definition of invalid for Students

  1. :  a person suffering from sickness or disability




Law Dictionary

invalid

play play
adjective in·val·id \in-ˈva-ləd\

Legal Definition of invalid

  1. :  being without force or effect under the law <declared the will invalid>

invalidly adverb




Seen and Heard

What made you want to look up invalid? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

marked by propriety and good taste

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

oily prompt angry maudlin
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ