控えめな Englisch:

You need to be discreet when talking to a patient.

When you're talking to customers, you have to be very discreet.

It wasn't very discreet of you to forget the appointment.

Among orang-utans, alpha males copulate openly but subordinates are so discreet that nobody realised they mated at all until the advent of genetic paternity testing

Try to be as discreet as possible as he 's very sensitive and easily upset.

Tens of thousands of discreet rules, 60 steps to suspend...

To do him justice, he is a discreet man.

You should be more discreet in expressing yourself in public.

You weren't particularly discreet, so it's no wonder you got caught.