Quickness is the quality of being fast or happening in a short amount of time. A basketball player's quickness helps them steal the ball and race downcourt before defenders can react. A chef's quickness with a knife means they can chop vegetables in seconds flat.

The word captures rapid action in short bursts, especially at the start of a movement. A sprinter has quickness off the starting blocks. A student who shows quickness of mind grasps new math concepts almost instantly. It names that snappy, immediate quality of fast movement or fast thinking.

You'll often hear people distinguish between quickness and speed. While speed measures how fast you can go over a distance (like running a mile), quickness is about short, explosive movements or rapid reactions. A soccer goalie needs quickness to block a sudden shot. A debater's mental quickness helps them form sharp responses on the spot.