The phrase "more or less completed" is grammatically correct and can be used in written English.
It is typically used to indicate that something is close to being finished, but not entirely complete or perfect. Example: The research project is more or less completed, but we still need to make some final edits before submitting it.
Only Brasilia, once finally begun, was more or less completed on time.
He sustained himself with coffee and alcohol, and within six days had more or less completed four pieces.
This is now more or less completed, and the scrolls from the Judean Desert have been presented to the scholarly world in the form of critical editions".
In a nutshell, the fringe countries that were forced to adopt fierce austerity have more or less completed their course of treatment.
The Giza pyramids form a group of more or less completed monuments surrounded by many tombs of the royal family and the elite, hierarchically organized and laid out in neat patterns.
Not least the Last Judgement trilogy, more or less completed shortly before his death on the Isle of Man in 1854, in which the statutory damned and the saved, the good and the evil, paradise and urban chaos are posed in uttermost contrast.
Armstrong didn't win but Gibney nevertheless pressed on with the project, more or less completing his film.
The criminal and civil justice systems usually operate at more-or-less complete remove from one another.
By Jeffrey Toobin August 10, 2011 The criminal and civil justice systems usually operate at more-or-less complete remove from one another.
Scientists used to believe the opposite – that connections among brain nerve cells were fixed early in life and that adult brains were more-or-less complete and unchangeable.
By the time Liz and the girls returned from the weekend, I had turned that finishing-touch project into a more-or-less complete gutting of our entire upstairs.
