"Bądźmy mili."

Translation: Let's be kind.

[Yola448704]

Bądźmy mili - Let's be nice
Bądźmy życzliwi - Let's be kind
Bądźmy uprzejmi/grzeczni - Let's be polite

[Jellei]

Added "życzliwi".

[Xamik]

"Polite" is correct btw.

[Jellei]

It usually translates to "uprzejmy", but yeah, you're right. Added.

[Xamik]

Yup, well done!

[Arnoldpitt]

What is the dictionary form of badzmy?

[Jellei]

The basic one... well, "być". That's just a form of "to be".

https://en.wiktionary.org/wiki/by%C4%87#Conjugation - imperative, 1st person plural.