Antonyms of verb invalidate

3 of 4 senses of invalidate

Sense 1
invalidate, annul, quash, void, avoid, nullify -- (declare invalid; "The contract was annulled"; "void a plea")
       Antonym of validate (Sense 1)
      => validate, formalize, formalise -- (declare or make legally valid)

Sense 3
invalidate, nullify -- (show to be invalid)
       Antonym of validate (Sense 2)
      => validate -- (prove valid; show or confirm the validity of something)

Sense 4
invalidate, void, vitiate -- (take away the legal force of or render ineffective; "invalidate a contract")
       Antonym of validate (Sense 4)
      => validate -- (make valid or confirm the validity of; "validate a ticket")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb invalidate

4 senses of invalidate

Sense 1
invalidate, annul, quash, void, avoid, nullify -- (declare invalid; "The contract was annulled"; "void a plea")
       => cancel, strike down -- (declare null and void; make ineffective; "Cancel the election results"; "strike down a law")

Sense 2
cancel, invalidate -- (make invalid for use; "cancel cheques or tickets")
       => score, mark -- (make underscoring marks)

Sense 3
invalidate, nullify -- (show to be invalid)
       => negate, contradict -- (prove negative; show to be false)

Sense 4
invalidate, void, vitiate -- (take away the legal force of or render ineffective; "invalidate a contract")
       => change, alter, modify -- (cause to change; make different; cause a transformation; "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue")