General Antonyms:
* Incompleteness: This is the most straightforward antonym, meaning a state of being unfinished.
* Unfinished: This is a more direct way of saying something is not complete.
* Incomplete: Similar to unfinished, it implies a lack of completion.
* Lack of completion: A more formal way of stating that something is not complete.
Context-Specific Antonyms:
* Beginning: If you're talking about the beginning of a process, the opposite of completion is the start.
* Interruption: If something is stopped before completion, the opposite could be uninterrupted.
* Discontinuation: If something is stopped permanently before completion, the opposite could be continuation.
* Failure: If something is attempted but not completed successfully, the opposite could be success.
It's important to consider the specific situation to choose the best antonym.