Faintest

I haven't the faintest idea what you mean.

I haven't the faintest idea.

Tom didn't have the faintest idea what he was going to do the next day.

Tom doesn't have the faintest idea what Mary is trying to do.

I don't have the faintest idea.

I don't have the faintest idea how my computer works.

What does that mean? I haven't the faintest idea.

I don't have the faintest idea what Tom is trying to do.

I don't have the faintest idea what Tom and Mary are trying to do.

She didn't have the faintest idea.