1. makes something legally invalid or void
Usage: third person singular present tense of nullify
2. makes something ineffective or of no value
Usage: third person singular present tense of nullify

Examples

• The court ruling nullifies the previous contract.
• A single mistake nullifies all his hard work.
• The new evidence nullifies their argument.
• Bad weather nullifies our outdoor plans.
• The amendment nullifies that section of the law.
• Her apology nullifies any anger I felt.
• The discovery nullifies the old theory.