Mmm, it's a nice point. In a perfect coded system, there would of course be a way exactly to signify that you-the-writer were clear about what s/he-the-character is utterly unclear about. But language is fuzzy at its point of origin, which is us, and fuzzier at its point of arrival, which is the reader; we're all Humpty-Dumpty, we use words to mean what we want them to mean, and cannot guarantee that they will carry that meaning over the gulf. The best we can hope for is a close approximation (as witness this debate, where you and I would read the same word with at least the risk of utterly different reactions to it); which being true, it has to be wiser to avoid words that are fuzzy at the outset. Doesn't it?