Theyre just trying to keep out foreigners and going about it in an underhand way.

Making a fair profit is important, but it can't be done in an underhand and predatory way.

No doubt he was plotting some further underhand way to get the cottage off her.

However, it may be done in more underhand ways, such as:

In a thoroughly sneaky, underhand way, I may say, but there it is.

She went out to meet someone in an underhand way when she had a pretty pressing engagement at home.

I do nothing myself in an underhand way.

I strongly resent having my views sought in such an underhand way.

This is just an underhand way of making workers redundant.

But not in such an underhand way as this.