You could apply this adjective to the Road Runner cartoon character, Olympian Usain Bolt, or your dog sprinting after a tennis ball. From the Latin “velox,” meaning “quick,” “velocious” describes something fast. It’s not a common adjective — you’re more likely to use synonyms such as “quick,” “rapid,” “brisk,” or “high-speed” — but it’s appropriate to pull out in circumstances where you want to wittily emphasize how absurdly fast something is occurring.