nullify

Verbs

(v) declare invalid
- The contract was annulled
- void a plea
annul, invalidate, void, quash, avoid,
(v) show to be invalid invalidate,
(v) make ineffective by counterbalancing the effect of
- Her optimism neutralizes his gloom
- This action will negate the effect of my efforts
neutralize, neutralise, negate,

Synonyms

annul invalidate void quash avoid neutralize neutralise negate

Antonyms

validate formalise formalize

Words of close approximity

nullity