Traditional: 快樂
快乐 (kuài lè) means “happy; joyful”. It is an HSK 2 Chinese word (traditional 快樂) in the HSK 3.0 vocabulary.
Practice each character:
祝你生日快乐!
Zhù nǐ shēngrì kuàilè!
Happy birthday to you!
Updated: 2026-05-27