There are many synonyms for the word "useless" that you can use to add variety and interest to your writing. Some common synonyms include meaningless, pointless, futile, ineffective, ineffectual, worthless, and inadequate. Other options may include unproductive, irrelevant, inconsequential, unavailing, unsuccessful, and impotent. No matter which word you choose, it is essential to pick a term that accurately conveys the sense of inadequacy or lack of usefulness that you are trying to express. By selecting the right synonym, you can make your writing more vivid and engaging, and encourage your readers to connect with your ideas on a deeper level.