tread carefully
tread warily
tread cautiously

I tread warily, covering my complete lack of information.

We were treading warily and softly, and they did not see us.

Yet his three Democratic rivals in the mayor's race are treading warily around him right now.

For now, Washington can be expected to tread warily.

And the Master has to tread warily between all these powers.

I'll have to tread warily though, both with him and with the city in general.

This looked more like political interest than police interest and he knew enough to tread warily here.

And Charis, treading warily, dared not ask too many questions.

"Well, something's got him all worked up, so tread warily around him."

Today, food professionals must still tread warily on commercial turf.