More nullifying means increasing or intensifying the act of nullifying, which means to cancel or invalidate something. Antonyms for more nullifying can be words like validating, affirming, approving, confirming, or ratifying. If something is validated or approved, it means that it is accepted and recognized as authentic or true. Confirming something also means acknowledging its validity or accuracy. Ratifying means officially approving or sanctioning something, such as an agreement or a treaty. Therefore, antonyms for more nullifying can be synonyms for affirming or approving, which represent the opposite action of nullifying.