这些威胁可不能等闲视之。

These threats are not to be taken lightly.

这样的违法行为不可等闲视之。

Such an illegal act should not be treated lightly.

我们对这个警告绝不能等闲视之。

We cannot afford to ignore this warning.

这个问题值得我们关注，决不可等闲视之。

This problem deserves our full attention. It's not to be shrugged off.