nullify

1. (verb) make ineffective by counterbalancing the effect of; "Her optimism neutralizes his gloom"
Synonyms: neutralize
Related Words: weaken

2. (verb) show to be invalid
Synonyms: invalidate
Related Words: contradict, negate

3. (verb) declare invalid; "The contract was annulled"; "avoid a plea"
Synonyms: annul, avoid, invalidate, quash, void
Related Words: break, cancel



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