Walking slowly could be a painful experience for someone who is in a hurry or has a busy schedule. However, we have synonyms, such as "strolling leisurely", "sauntering", "moseying", "meandering", or "trudging", which can be used to vary the pace of walking. Antonyms of "walking slowly" could be "running", "whizzing", "hurrying", "speeding", or "hastening". These antonyms can help convey the idea of urgency and excitement. Another set of antonyms could be "marching", "striding", "power walking", or "trotting", which indicates a more deliberate pace that is focused on exercise, strength, and a sense of purpose.