If you are circumspect, you are cautious in what you do and say and do not take risks.
例句
The banks should have been more circumspect in their dealings...那些银行在交易中本该更加谨慎的。You seem to be implying, in your usual circumspect manner, that perhaps it might not be a wonderful idea.你好像正以你一贯谨言慎行的方式暗示，那个主意也许不怎么样。