快乐
kuài lè
In real, traceable use. Part of the curated seed collection; community review is coming.
Traditional: 快樂
Happy, joyful, cheerful. It describes a lasting mood or a happy time: 我很快乐 'I am happy', 快乐的孩子 'a happy child'; being glad about one particular thing is 高兴. It is also the word of good wishes: 生日快乐 'Happy birthday', 新年快乐 'Happy New Year'. Here 乐 is read lè; in 音乐 'music' it is yuè.
Vui vẻ, vui sướng, hạnh phúc. Dùng để tả tâm trạng lâu dài hoặc một quãng thời gian vui: 我很快乐 (tôi rất vui), 快乐的孩子 (đứa trẻ vui vẻ); còn vui mừng vì một việc cụ thể thì nói 高兴. Đây cũng là từ của các lời chúc: 生日快乐 (chúc mừng sinh nhật), 新年快乐 (chúc mừng năm mới). Ở đây 乐 đọc là lè; trong 音乐 (âm nhạc) thì đọc yuè.
AdjectiveRegister: neutral
Examples
Editorial example (illustrative, not a corpus attestation) — awaiting a native-speaker check
Sources & notes
Hán-Việt bridge batch 063 (2026-11-14). Headword, Traditional form and pinyin checked against CC-CEDICT (CC BY-SA 4.0) source ↗ · Hán-Việt reading: Unihan kVietnamese source ↗ · Vietnamese false friend: Idiomer entry “khoái lạc” (khoai-lac). Definition, literal gloss and example sentence are original; the example has not had a native-speaker check yet.
Equivalents & related
Common questions
What does “快乐” mean?
Happy, joyful, cheerful. It describes a lasting mood or a happy time: 我很快乐 'I am happy', 快乐的孩子 'a happy child'; being glad about one particular thing is 高兴. It is also the word of good wishes: 生日快乐 'Happy birthday', 新年快乐 'Happy New Year'. Here 乐 is read lè; in 音乐 'music' it is yuè. Literally: glad and joyful
Is “快乐” formal or informal?
快乐 is generally neutral.