快 - PLEASANT Is the Lightened Heart

Readings & Meanings:

カイ

こころよ（い）

pleasant

Common Usage:

快い

快方に向かう

快速列車

愉快

Examples:

彼はその無理なお願いを快く引き受けてくれた。

病気が快方に向かう。

７時の快速列車に乗りそびれた。

彼は顔に似合わず愉快な人だ。

Translations:

He cheerfully took up that impossible request.

Her illness is getting better.

I missed the 7:00 express.

Although his face doesn't show it, he's a pleasant and happy person.

Radical:

With a reading like こころよい, you'd think 心 would be in there. Well it is!

On the left there is the Kokoro radical, in 心's vertically-squished form.

The phonetic is 夬, which shows a hand scooping out a a hole.

A heart (心) with all the bad stuff scooped (夬) out would certainly be pleasant.

References:

http://www.kanjinetworks.com/indices/radindex.html
http://www.thejapanesepage.com/node/kanji/ka.htm