No idea at all.

Not the vaguest.

He has an idea.

He had an idea, a very clear idea.

We have really no idea.

I haven't any idea.

I haven't got any idea.

I don't have a clue.

I haven't the least idea.

I had no idea.

I have absolutely no idea.

I wouldn't have any idea.

I have no idea.

I haven't the faintest idea.

You have no idea what a job this was.

Dad, being an academic, had no idea that Mike's Hard Lemonade contained alcohol.

He had no concept of the idea of an algorithm, but that's what he described in that book, and this is what we now know as the evolutionary algorithm.

Nobody has a clue

Papa, you have no idea.

Linus, you won't forget the gardenias?

Walt White has no clue he's occasionally funny, but as an actor I recognize when there are comedic moments and opportunities.

And they didn't even know.

'I haven't the slightest idea,' said the Hatter.

To be honest, I have no idea.

You have no idea what you're talking about.

I'm sorry. I haven't the faintest recollection.

I have no idea, my boy.

I haven't the slightest idea... have you?

You've no idea how much I hate you.

That's just it I haven't the faintest idea.

I had no idea of the difficulties.

Olfat Gushgari echoes a similar idea

I have no idea where she lives.

I have no idea how he does it.

Okay, I have no idea what we're going to play.

What would that mean? I have no idea.

In what capacity, I have no idea.

You have no idea what we went through.

I haven't the least notion what it was she lost.

I'd no idea how much I missed it.

You haven't the faintest idea what Naples is like.

You've no idea of anything!

I had absolutely no idea what was going to happen next.

You're claiming stuff I don't have a clue about.

We've no idea how long we have.