Noodles around is an informal phrase that means to waste time, procrastinate, or be idle. However, there are several antonyms for this phrase that describe activities that are productive or purposeful. One antonym could be "working diligently," which implies being focused and productive. Another antonym could be "task-oriented," which suggests having a specific goal or objective to accomplish. "Active," "proactive," and "efficient" are other antonyms that describe actions that are energetic, forward-thinking, and effective. By using these antonyms instead of "noodling around," we can communicate a more positive and productive approach to our work or activities.