fly blind

For the last hour, they'd been flying blind through thick fog.

He was flying completely blind and they all knew it.

Here we are, three years into the global financial crisis, and we're still flying blind.

The ape had a thought-screen1 on, so he was flying blind.

So we're flying blind on a lot of things we've never encountered before.

Smaller individual investors are more likely to be flying blind, and could get hurt.

They have to fly blind a little bit and trust the instrument.

The Enterprise was flying blind in more ways than one.

"We're flying blind here until we get a good look at one of those things."

So for now, a lot of experts are flying blind - and they admit it.