no small matter
这个问题可不小，而且一下牵涉两件事。
This is no small issue, and it involves two things at once.
看样子这工程可不小哇
Looks like this is quite a big project, huh?
— 一一 (2000)
妳这副牌可不小！
You’ve got quite a hand there!
— 色‧戒 (2007)
你胆子可不小，看我怎么收拾你
You've got some nerve. Just you wait—I'll teach you a lesson.
— 活着 (1994)