nullify Get Printable Handwriting (nul-li-fy) 3 syllables Rhymes Learn It! Spelling Test Definition verb. to make legally null; make void; annul to make valueless or useless; bring to nothing to cancel out Example Sentence The new agreement will nullify the old agreement. Synonyms invalidate; annul; quash; void; avoid; cancel; strike down Antonyms validate; encourage; improve Rhymes Three Syllable Rhymes (1) nullify Share with your friends: