самастойна in English:

Definition if you do something independently, you do it yourself and do not allow anyone else to organise it or help you with it

Do you prefer to work independently or in a team?

The advisory board had a lot of qualms about her latest album, which she ended up releasing independently.

After the bushfires, we have independently decided to call off this year's fireworks display.

There are problems that Japan might not be able to solve independently but which it might be able to solve in cooperation with Korea.