Quick

1. Moving with speed, rapidity or swiftness, or capable of doing so; rapid; fast. He's a quick runner.
2. Occurring in a short time; happening or done rapidly. That was a quick meal.
3. Lively, fast thinking, witty, intelligent. My father is old but he still has a quick wit.
4. Raw or sensitive flesh, especially that underneath finger and toenails.
5. The vital core; the essence. She got to the quick of the matter.
6. Living. He shall come to judge the quick and the dead.