Fetching details from the dictionary...
very; considerably; easily; readily; fairly; quite; highly; rather
by no means; not readily
middle; half-way point
excellent; wonderful; very good
なかなかいい映画だった。
It was quite a good movie.
なかなか終わりません。
It will not end easily.
この問題はなかなか難しいね。
This problem is quite difficult.