I was surprised, to say the least.

毫不夸张地说，我感到吃惊。

Her remarks were ill-advised, to say the least.

她的话不够谨慎，至少可以这么说。

This is not the proper way to handle the matter, to say the least.

至少可以说，这样处理不妥。

I was, to say the least, nervous.

我可以说，至少是，紧张的。

I was confused, to say the least.

至少可以说，我确实感到很迷惑。