kulturno

1. (of behaviour) politely; in a civilized manner
   Kulturno sam ga zamolio da utiša muziku. — I politely asked him to turn the music down.
   Ponašajte se kulturno u autobusu. — Behave in a civilized way on the bus.
2. culturally
   Novi Sad je kulturno veoma bogat grad. — Novi Sad is a culturally very rich city.

In everyday speech it most often means "politely, decently".