The antonyms for the phrase "clean one act" can be conveyed in different ways, depending on the context. Some possible antonyms include "dirty," "unclean," "messy," "cluttered," or "disorganized." These words signify a lack of cleanliness and order in one's actions, whether it is in performing a task or completing a project. The opposite of a clean one act may imply inefficiency, carelessness, or ineffectiveness. However, it is important to note that these antonyms do not necessarily imply intentional wrongdoing or neglect. Instead, they suggest a deviation from the standards of cleanliness and clarity in one's actions.