"Nulling" is a word that means to cancel, void, or render something invalid or irrelevant. To express this concept in other terms, we could use synonyms such as negate, annul, abolish, or negate. These words all convey the idea of voiding something, whether it be a contract, an argument, or a situation. Another way to say "nulling" is to use the word "void", which means to make something empty or invalid. Other synonyms for this concept include revoke, rescind, and override. By using these various words, we can express the same idea in multiple different ways, depending on the context and audience.