1. to make something legally null and void; to cancel or invalidate
Usage: legal
2. to make something ineffective or meaningless; to counteract

Examples

• The court decided to nullify the contract due to fraud.
• The new evidence could nullify the previous ruling.
• His careless mistakes nullified all his hard work.
• The antidote will nullify the effects of the poison.
• The state attempted to nullify the federal law.
• Her positive attitude nullified the negative comments.
• The judge has the power to nullify the jury’s verdict.