quick, pleasant

快 is composed of the radical 心 (heart) and 夬 (decisive). 心 refers to consciousness or the mind, while 夬 depicts a hand holding a notched ring-shaped jade artifact, meaning resolute or without hesitation. The perception of time’s speed is inherently subjective, so 快 represents swiftness or speed. Additionally, when everything is satisfactory to the mind, there is no need for hesitation, so 快 also means happiness or pleasure.