The phrase "almost completely abandoned" is correct and usable in written English.
It can be used to describe a place or situation that has very few remaining inhabitants or users, indicating a high level of abandonment.
Example: "The once-bustling town is now almost completely abandoned, with only a few residents left."
Alternatives: "nearly deserted" or "practically forsaken".
Unicef found that by 2008 circumcision had been almost completely abandoned.
Major highways like Interstate 93 were almost completely abandoned; downtown Boston, in blizzard conditions, was a ghost town lost in a swirl of howling winds and snow.
During various seasons of the year, isolated villages are almost completely abandoned by able-bodied men and women as they go to the United States to work.
The president, Recep Tayyip Erdoğan, made it a vote about his "way", and found himself rejected by a large group of "democrat" voters – and almost completely abandoned by his long-term allies: pious Kurds.
On "Imperial Blaze" — produced largely by Stephen McGregor, known as Di Genius, one of Jamaica's most promising young talents — Sean Paul has almost completely abandoned his grimier side in favor of sung melodies and soft subject matter.
Wade is a fantastic finisher and a brilliant post-up player, but whether by injury or simply poor judgment, he's almost completely abandoned both of those aspects of his game for the sake of the low-percentage shot of least resistance.
Some dishes ventured too far for me, almost completely abandoning their sense of place, like the grilled scallop with tomato salad, mozzarella and lobster vinaigrette, accompanied by a champagne glass containing tomato and orange jelly with basil foam.
However, the sensitive property of SampleRate almost completely abandons the opportunities.
We went back with him to see his home in Pripyat, a city of almost 50,000 people that is now completely abandoned.
The Maya had completely abandoned the site by about 1200.
