The word "not" is one of the most commonly used negative words in the English language. However, it can become repetitive and leave the reader feeling disinterested. That's why it's important to have a few synonyms up your sleeve. Some of the most commonly used alternatives include: no, negative, never, denied, refused, and unaccepted. These words have their own unique nuances and can be used to convey different levels of negativity. Some other less commonly used but still effective synonyms include: nay, veto, repudiate, disallow, and negate. Using a variety of negative words can add interest and emphasis to your writing while still conveying the intended message clearly.