About
The left-side radical 忄 (xīn), a variant of the heart radical, situates the character's core meaning within the realm of emotions and psychological states. The right component 夬 (guài) serves as the phonetic element. Its original sense denoted gladness or cheerfulness. This feeling of eager delight naturally extended to imply swift, energetic action, giving rise to its secondary and now dominant meaning of speed or quickness. While modern usage primarily employs 快 for high velocity, its original sense of happiness remains active in common compounds expressing joy and pleasure.
Etymology Hide
Example Sentences Hide
快点过来！
我今天很快乐。
火车跑得真快。
快递员送来了包裹。
你快把作业写完。
时间过得快极了。
祝你生日快乐！
快点起床，不然就要迟到了。