The phrase "fiddles around" is commonly used to describe someone who is wasting time or being unproductive. However, there are many synonyms that can be used to convey this meaning more clearly and effectively. Some potential options could include terms like "dawdles," "loafs," "idles," "lollygags," "procrastinates," "piddles," or "wastes time." By choosing an appropriate synonym, writers or speakers can more easily convey the intended message, and prevent any possible confusion or misinterpretation. Additionally, using descriptive adjectives or phrases can help to emphasize the severity or negative consequences of this behavior, such as "pointlessly fussing around" or "wasting precious time and energy".