Speed and efficiency
In speed words, 快 (kuài) means fast, quick, or to accelerate.
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快has 2 distinct senses for the same pronunciation

In speed words, 快 (kuài) means fast, quick, or to accelerate.
as quickly as possible
In emotion words, 快 (kuài) means happy, joyful, or cheerful.
In daily-life words, 快 (kuài) appears in terms like express delivery, fast food, and about to.
nearly at the point of (doing sth); about to (do sth)
cool
Diligent and quick / industrious
He walked into the classroom with quick steps.
He walks very fast.
The children are playing happily in the park.
This camera's shutter speed is very fast.
This train runs very fast.
Explore characters by relationship
Characters from the same exam level.
Characters pronounced "kuai".
Characters with radical "忄".