Here are some possibilities based on what you might have meant:
* "Offen" means "open" in German. This is the most likely possibility, especially if you're thinking about something being open or not closed.
* "offen" can also mean "frank" or "candid", as in "He was very offen about his feelings."
* "Offenbar" means "obviously" or "clearly".
* "Offenheit" means "openness".
* "Offensichtlich" means "evidently" or "clearly".
If you could provide more context, I could help you figure out the correct meaning!