Formal:
* Cicho! (pronounced "tsee-ho") - This is the most direct and straightforward way to say "be quiet".
* Proszę, cicho! (pronounced "proh-sheh tsee-ho") - This is a slightly more polite way to say "please be quiet".
Informal:
* Cisza! (pronounced "chee-sha") - This is a more informal version of "cicho" and means "silence!".
* Sssst! (pronounced "sssst") - This is a very informal way to say "be quiet" and is often used to shush someone.
* Chicho! (pronounced "chee-ho") - This is a more informal version of "cicho" and is often used with children.
Other options:
* Nie rób hałasu! (pronounced "nye-roo hab-lah-soo") - This means "Don't make noise!"
* Mów ciszej! (pronounced "muf tsee-shey") - This means "Speak quieter!".
The best way to choose the right phrase depends on the situation and your relationship with the person you are talking to.