When it comes to trying something repeatedly with no success, there are plenty of synonyms for the phrase "vain attempts." Some possible options include futile efforts, fruitless endeavors, unsuccessful trials, unavailing actions, pointless endeavors, ineffective endeavors, and wasted attempts. All of these phrases describe the same thing - trying something over and over again without achieving the desired outcome. Whether you're talking about a personal goal, a work project, or any other type of endeavor, these synonyms can help you describe the situation more effectively and efficiently. So the next time you're struggling to find success in any area of your life, remember that there are many different ways to describe what you're going through.