English to English

verb (v)

• declare invalid(verb.social)

  Synonym:
  annul, avoid, invalidate, quash, void
  Antonym:
  formalise, formalize, validate
  

  source: wordnet30
• show to be invalid(verb.cognition)

  Synonym:
  invalidate
  Antonym:
  validate
  

  source: wordnet30
• make ineffective by counterbalancing the effect of(verb.change)

  Synonym:
  negate, neutralise, neutralize
  

  source: wordnet30
• To make void; to render invalid; to deprive of legal force or efficacy.(verb)

  source: webster1913