"nullify" in the verb sense

1. invalidate, annul, quash, void, avoid, nullify

declare invalid

"The contract was annulled"

"void a plea"

2. invalidate, nullify

show to be invalid

3. neutralize, neutralise, nullify, negate

make ineffective by counterbalancing the effect of

"Her optimism neutralizes his gloom"

"This action will negate the effect of my efforts"

Source: WordNet® (An amazing lexical database of English)

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