Translation of "Quieter" in Japanese

- Quieter!
- Quieten down!

静かに！

Could you be a little quieter, sir?

お客様、もう少しお静かに。

Hey, can you please be a bit quieter?

ちょっと、頼むから少し静かにしててくれるかな？

- Don't talk so loud.
- Talk quieter.
- Talk more quietly.
- Speak more quietly.
- Speak a little bit more quietly.

もう少し小さい声で話してください。