There should be a tag for films that end unexplained

There are many films that i put up with just to see the ending only for it to cheap out and leave everything unexplained.
If there was a tag for non ending films it would save me wasting my time on the hope that its going to get better at some point.
films that come to mind is cube and a foreign film where a woman finds a invisible wall in her village that she cant escape from.
There is many others but when movies fall so short i usually forget them