They have even been so underhanded as to issue restraining orders.

It seems so ... so underhanded to be doing these things behind his back!

I wouldn't have bet he'd be so underhanded and dirty, but I wouldn't have bet he'd be murdered, either.

"I find them so underhanded and unpleasant-lurkingoutside bedroom windows is not my cup of tea."

"I cannot believe that they would do anything so underhanded and dishonorable," said Wallace, greatly shocked.

"You make it sound so underhanded."