This is the 14254th most frequent Russian word.
оставшиеся
"Remaining" or "left."
Here, 'оставшиеся' is used as an adjective in the nominative plural form, describing 'неиспользование ресурсы' as 'remaining'.
Мы распределили все ресурсы, оставшиеся после прошлого проекта.
We allocated all the resources remaining after the last project.
In this example, 'оставшиеся' describes the noun 'вопросы', conveying 'remaining' or 'not yet addressed'.
Оставшиеся вопросы обсудим на следующей встрече.
We will discuss the remaining questions at the next meeting.
Here, 'оставшиеся' is used as a descriptive adjective for 'файлы', indicating 'that which is still present or occupying space'.