快 — “pleasant / cheerful” in Japanese

Grade 5かい, こころよ

Radical ⼼ · radical 61 The building block this kanji is filed under

“pleasant / cheerful” in Japanese is 快, read kai, kokoroyo (かい, こころよ). It is a Grade 5 Kyōiku kanji, taught in year 5 of Japanese elementary school, and appears in words such as 快適 (comfortable).

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What does 快 mean?

Full details, readings & example

Kanji	快
Meaning	pleasant / cheerful
Readings	かい, こころよ
Grade	Grade 5 (Hard)
Curriculum	Kyōiku kanji · Japanese elementary school
Example	快適 (comfortable)

How to read 快

快 is read kai (かい) or kokoroyo (こころよ) depending on the word.

Words with 快

快勝かいしょう
快適
愉快
爽快

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Kanji read the same way as 快

Same sound, different character — the classic trap. Compare them side by side:

Read this character in a real sentence

🚄 新幹線の個室、二十三年ぶりの復活 Grade 5

Updated: 2026-08-28