kooperativan

1. (of a person) cooperative
   Svedok je bio veoma kooperativan sa policijom. — The witness was very cooperative with the police.
   Kolege iz drugog odeljenja nisu baš kooperativne. — Our colleagues from the other department aren't very cooperative.
2. (of a game, work) cooperative; co-op
   Volim kooperativne igre sa prijateljima. — I love co-op games with friends.

With whom: biti kooperativan sa + instrumental.