Looking for something similar to "Views selective filters", just with "inactive" instead of "removed" The Views Selective Filter module reduces the filter items in a views exposed filter to only those having actually results. 

I'm searching something similar, but I don't want to hide the options with no results, instead I want to make them inactive (shown greyed out).

The exposed filter list I have is just a vocabulary with some category terms.

Is there a module for this somewhere out there? Or how can I achieve that?
How are you going to gray out items in a combobox? If using Better Exposed filters module to replace the combox with some other widget, you can easily use Views Selective Filters and some Javascript to do the magic.