Most relevant fast-paced antonyms Slow-moving, sluggish-paced, slow, slowest. Also relevant: Dull, flat, uninteresting, boring, tame. The opposite of fast is slow. A slower pace suggests careful consideration and less urgency than when talking about a fast pace. Slowing something down makes it more thorough or complete. Thus, life at a slow pace is more efficient and effective than life that is fast paced. This is because slowing things down allows time to consider all aspects of a problem before reaching a decision which helps to avoid making mistakes. At a slow pace, people can relax and have fun too!