He managed to say it without a trace of good humor.

There was no trace of humor in his voice or expression.

Then, for the first time, he smiled with a trace of true humor.

Nelson asked with a trace of humor in his voice.

I looked for traces of humor on her long, strange face, but didn't see any.

They were cold and clear, without a trace of humor or compromise.

But there was not a trace of humor in the thing.

For the first time, there was a trace of humor in them.

If there had been any trace of humor in his voice to start with, it was gone now.

All trace of humor was gone from his face now.