"Moving fast" can be described in various ways based on intensity, pace, and purpose. Some synonyms that connote briskness include swift, rapid, speedy, and quick. Other related expressions are hastily, briskly, expeditiously, and lightning quick. When referring to an object or person that moves fast, options include fleet-footed, nimble, agile, and quick-witted. For those who are focused on fast progress or a particular goal, appropriate terms are accelerated, hastened, expedited, and advanced. When it comes to moving fast in a dynamic or thrilling way, some fitting adjectives are high-speed, turbo-charged, frenzied, and frenetic. Ultimately, the right synonym for moving fast depends on the context, vibe, and desired tone of the message.