快 kuài
adjective | adverb
: rapid; quick; speed
: rate; soon
: almost; to make haste
: clever; sharp (of knives or wits); forthright; plain-spoken
: gratified; pleased; pleasant
Kun Reading
快い | こころよい kokoroyoi
adjective
: pleasant; agreeable
快く | こころよく kokoroyoku
adverb
: comfortably; cheerfully; willingly; gladly
On Reading
快 | かい kai
noun
: pleasure; delight; enjoyment