快 means 'comfortable'

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Strokes : 7    Frequency: 912   JLPT: N2    Usefulness: 4    Study set: 4-10    Grade: 5   Intermediate lesson: 44    Beginner lesson: -   Begins 67 words   Used in 96 words   Used in 161 names   Component in 1 kanji (0 Jōyō)
Jōyō (常用)
   こころよ comfortable, pleasant, refreshing
Name    よし
⿰   () heart   decide  
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In the most useful 10,000 words in Japanese, 快 is used 10 times, read 2 ways.
Across all words in Japanese, 快 is used 95 times, read 2 ways.
カイ : 93 words FIND ALL
pleasant; agreeable; comfortable
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こころよ : 2 words FIND ALL
pleasant; agreeable
(click the word for examples and links)
An additional one less common word includes 快 but the reading has not yet been categorized.
Henshall: 661 (originally: 631)  Joy o' Kanji : 631  Key to Kanji: 98 

Cascading kanji view

カイ   こころよ comfortable, pleasant, refreshing   
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カイ   ケツ    decide, determine   
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