Undone (adjective)

1. Not done; not finished or completed.
2. Not having been done, made or performed.

Origin:

Old english, from un- (expressing reversal) + dōn "done"; compare with undo.

Examples:

1. The work was left undone due to lack of time.
2. The undone button on her blouse was causing her embarrassment.
3. The undone task was added to the list for the next day.
4. The undone homework was causing her stress.
5. The undone project was causing delays in the department.