nullifying

1. declare invalidExamples: "The contract was annulled"; "void a plea"Synonyms: annul, avoid, invalidate, nullify, quash, voidAntonyms: validate

2. show to be invalidSynonyms: invalidate, nullifyAntonyms: validate

3. make ineffective by counterbalancing the effect ofExamples: "Her optimism neutralizes his gloom"; "This action will negate the effect of my efforts"Synonyms: negate, neutralise, neutralize, nullify