Futilitarianism is a term that refers to the belief that all human actions are ultimately pointless, or that there is no purpose to life. However, if you're looking for synonyms to this word, there are a few options to choose from. One possible synonym could be nihilism, which is the idea that life has no inherent meaning or value. Another option might be existentialism, which emphasizes individual freedom and the search for meaning in a seemingly absurd world. Some related words could also include absurdism, pessimism, or fatalism. Ultimately, the choice of synonym will depend on the context and connotations you're trying to convey.