I had originally looked at Rodriguez’s sentence and tried inserting a ‘very’ before ‘unquestioned’ (since that’s a standard trick for distinguishing past participles used as modifiers from those used as part of a passive). When it “failed,” I put the problem down to ‘unquestioned’ being non-gradable, rather than to it being part of a passive. To me, something’s either unquestioned or it’s not, and I can’t do the same thing with “very unquestioned” that I do with “very unique” (for which my meaning is “unique in a very relevant or dramatic way, instead of being the only person in the room with green shoelaces”).  I fully agree it’s adjectival here; I just thought the sentence pointed out one of the weaknesses of the “very test.”