Not if he hasn't got the slightest idea what anyone is talking about.

No one here had the slightest idea who he was.

And I hadn't the slightest idea what to do with myself.

But he didn't have the slightest idea how to begin.

She had not the slightest idea of why one read books.

I haven't got the slightest idea how this thing works.

"Have you got the slightest idea of what he was talking about?"

I hadn't the slightest idea of what he was talking about.

What 1990 will really look like I haven't the slightest idea.

How could he have had the slightest idea of what I was talking about?