我相信你会对我刚才告诉你的事情守口如瓶。

I trust you'll be ___discreet about what I just told you.

保安非常谨慎，从未侵犯我们的隐私。

The security guard was ___discreet and never intruded on our privacy.

讨论这些敏感的财务信息时，请务必谨慎。

Please be ___discreet when discussing this sensitive financial information.