General opposites:
* Unfinished: This is the most straightforward opposite.
* Incomplete: Similar to unfinished, but emphasizes the lack of completion.
* Ongoing: Implies that something is still in progress.
* Pending: Suggests that something is waiting to be finalized.
More specific opposites:
* Started: If you're talking about beginning something, this is the opposite of finished.
* Beginning: Similar to started, but emphasizes the initial stage.
* Initial: Refers to the first part of something, as opposed to the final part.
* Unbegun: This implies that something has not been started at all.
The best word to use will depend on the specific situation.