Swift means moving or happening very quickly. A swift runner crosses the finish line while others are still racing. A swift response to an email comes back within minutes instead of days. When something is swift, it has speed and immediacy.

The word often suggests smoothness and efficiency along with speed. A hawk makes a swift dive toward its prey, cutting through the air with precision. A judge might deliver swift justice, making a fair decision without unnecessary delay. A chess player who spots the winning move and acts on it right away demonstrates swift thinking.

You can also use swift as a noun: a swift is a small bird that looks similar to a swallow. These birds are incredibly fast fliers, which is how they got their name. They spend most of their lives in the air, catching insects mid-flight and even sleeping while gliding.

When you act swiftly, you move with both speed and purpose. Being swift means getting things done quickly and well, with focused intention. A swift decision might save the day, while a swift apology can repair a friendship before hurt feelings grow.