invalidate
[verb]
Synonyms: nullify, annul, cancel, overthrow, undermine, undo

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Antonyms: validate
Related Words: counteract, counterbalance, negative, neutralize, offset, discredit

[TahlilGaran] English Synonym Dictionary ▲

in‧val‧i‧date AC /ɪnˈvælədeɪt, ɪnˈvælɪdeɪt/ verb [transitive]
[Word Family: verb: validate ≠ invalidate; noun: validity ≠ invalidity; adjective: valid ≠ invalid]

1. to make a document, ticket, claim etc no longer legally or officially acceptable:
Failure to disclose all relevant changes may invalidate your policy.

2. to show that something such as a belief or explanation is wrong:
Later findings invalidated the theory.

[TahlilGaran] Dictionary of Contemporary English ▲