Cautious

As far as Bob is concerned, anything goes. By contrast, Jane is very cautious.

He is too cautious to try anything new.

He was cautious about overeating.

She is cautious of giving offense to others.

Since his arrival in town, all the women have remained cautious about him.

Tom thinks that Mary is being unnecessarily cautious.

We must be cautious.

You must be cautious.

You will never find a more wretched hive of scum and villainy. We must be cautious.

She's extremely cautious.