"And you know I am not a man who is often at loss for words."

For a moment she was at a loss as to what to do next.

And she was at a loss about how to get the money back.

In other words, you will not be at a loss for things to do here.

How often had he been at a loss for words in his life?

And then seemed at a loss for anything else to say.

For a moment he seems to be at a loss.

I was at a loss to know what you were feeling.

In fact he was at a loss for something to say.

I'm really at a loss as to what you thought I was trying to say?