Antonyms of verb validate

3 of 4 senses of validate

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

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

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

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

4 senses of validate

Sense 1
validate, formalize, formalise -- (declare or make legally valid)
       => authorize, authorise, pass, clear -- (grant authorization or clearance for; "Clear the manuscript for publication"; "The rock star never authorized this slanderous biography")

Sense 2
validate -- (prove valid; show or confirm the validity of something)
       => confirm, corroborate, sustain, substantiate, support, affirm -- (establish or strengthen as with new evidence or facts; "his story confirmed my doubts"; "The evidence supports the defendant")

Sense 3
validate, corroborate -- (give evidence for)
       => confirm, reassert -- (strengthen or make more firm; "The witnesses confirmed the victim's account")

Sense 4
validate -- (make valid or confirm the validity of; "validate a ticket")
       => 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")