Added 9 October 2026 nullify /ˈnʌlɪfaɪ/ verb Categories: SocietyMind & IdeasRare Words verb ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about nullify at Wordnik → Where our words come from → To make legally invalid. The contract has been nullified. To prevent from happening. To make of no use or value; to cancel out. Related Words: invalidateavoidneutralizeannulquashvoiddenyrefuseprecludeexcludeneutralisenegate Back to today's word