invalidate — English Dictionary

Verb

1. To make invalid (especially in to contract law)

   Synonyms

   extinguishnullify

   Examples

   The circuit court judge's ruling was invalidated by a superior judge.

2. To make or declare (an argument, statement, or theory) unsound or erroneous; disprove.

   Examples

   The multiplicity of moral opinions is an empirical fact and does not invalidate the contention that there is only one morality par excellence.

3. To render invalid; discredit.

   Examples

   Telling an angry person to "calm down" can invalidate their feelings.

Verb

1. declare invalid

   Synonyms

   annulquashvoidavoidnullify

   Antonyms

   validate

   Broader terms

   cancelstrike down

   Examples

   The contract was annulled

   void a plea

2. make invalid for use

   Synonyms

   cancel

   Broader terms

   scoremark

   Examples

   cancel cheques or tickets

3. show to be invalid

   Synonyms

   nullify

   Antonyms

   validate

   Broader terms

   negatecontradict

4. take away the legal force of or render ineffective

   Synonyms

   voidvitiate

   Antonyms

   validate

   Broader terms

   changealtermodify

   Examples

   invalidate a contract