Vagueness is a characteristic of language, specifically of those term s which classify or qualify objects, that is, common nouns and adjectives. Such terms divide the world of objects into those the term applies to&#151the extension of the term&#151and those to which it doesn't.agueness is to be distinguished from ambiguity, though rather fittingly the distinction is vague! An ambiguous term is one with more than one meaning, whereas vagueness is characteristic of a single meaning that has borderline cases.