Ideographic: A decisive 夬 will 忄; 夬 also provides the pronunciationRadical:

meaning for kuài:

  • - rapid
  • - quick
  • - speed
  • - rate
  • - soon
  • - almost
  • - to make haste
  • - clever
  • - sharp (of knives or wits)
  • - forthright
  • - plainspoken
  • - gratified
  • - pleased
  • - pleasantto accelerate
  • - to speed upfast
  • - high-speed
  • - rapidas quickly as possible
  • - as soon as possible
  • - with all speedas quickly as possible
  • - as soon as possible
  • - with all speedhappy
  • - merry

kuài
xiěwán写完
le

I am almost finished writing.


zhè
liàngchē辆车
fēicháng非常
kuài

The car is very fast.


pǎodé跑得
hǎo
kuài
a

You run very fast!


yòng
bǐjìběn笔记本
diànnǎo电脑
shàngwǎng上网
sùdù速度
fēicháng非常
kuài

I surf the Internet with my laptop, which is very fast.


zhège这个
diàntī电梯
jiùyào就要
xiàqù下去
le
kuài
jìnlái进来
ba

The elevator is about to go down, come in quickly.