(pos:形容詞)(ant:慢)
<explanation>
yue:需時短、速度高
eng:fast; quick; rapid
<eg>
yue:#快餐 (faai3 caan1)
eng:fast food
<eg>
yue:#快線 (faai3 sin3)
eng:(of a motorway) the fast lane; (of public transport) express
<eg>
yue:你踩單車好快啊！ (nei5 caai2 daan1 ce1 hou2 faai3 aa3!)
eng:You ride your bike really fast!

(pos:副詞)(label:書面語)(sim:就)(sim:就嚟)(sim:就快)
<explanation>
yue:喺未來短時間之內
eng:soon; shortly
<eg>
zho:老師快到了。 (lou5 si1 faai3 dou3 liu5.)
yue:老師就到喇。 (lou5 si1 zau6 dou3 laa3.)
eng:The teacher is coming soon.
<eg>
zho:火車快要開了，趕快上車吧！ (fo2 ce1 faai3 jiu3 hoi1 liu5, gon2 faai3 soeng5 ce1 baa6!)
yue:火車就快開喇，快啲上車啦！ (fo2 ce1 zau6 faai3 hoi1 laa3, faai3 di1 soeng5 ce1 laa1!)
eng:The train is going to leave soon. Hurry up and get on!