The antonyms for the phrase "moving slowly" are many and varied, ranging from words that denote speed and agility to terms that suggest a swift and efficient movement. Some of the most commonly used antonyms for this phrase include words like swift, speedy, rapid, fast, quick, brisk, expeditious, and hasty. These words all suggest a quick, energetic, and efficient movement, often characterized by a sense of urgency and purpose. Other antonyms that might be used to describe the opposite of "moving slowly" might include terms like frenzied, frantic, intense, or hyperactive, which all suggest a rapid and highly energetic movement that is motivated by a sense of excitement or urgency.