His look was the most frightening thing she had ever seen.

The most frightening thing of all is that you understand exactly what he's feeling.

It had been the most frightening experience of his life.

It was the most frightening thing I had ever seen.

And then a most frightening thought took hold of me.

But the most frightening part to him was how hard his head hit the ground.

You are certainly the most frightening men I have ever seen.

This had to be the most frightening moment of his life.

He was the most frightening thing I'd ever seen in my life.

Indeed, in some ways, his is the most frightening story of all.