General:
* Incomplete
* Unfinished
* Partial
* Uncompleted
* Imperfect
* Deficient
* Insufficient
* Lacking
More specific:
* In progress: This emphasizes that the task is ongoing.
* Pending: This implies that something is awaiting completion.
* Incomplete: This is a more formal synonym for "not complete."
* Unfinished: This emphasizes that the task was started but not finished.
* Partial: This suggests that only part of the task was completed.
Informal:
* Half-baked: This implies that the task is poorly done or not thought through.
* Work in progress: This is a more informal way of saying "in progress."
* Not quite there yet: This is a casual way of saying that the task is not complete.
The best word to use will depend on the specific situation and the desired tone.