The antonyms for the word "more delineating" would be terms that connote vagueness, imprecision, and ambiguity. Some of these words include "indefinite," "fuzzy," "inexact," "obscure," and "muddled." These terms describe situations where there is no clear definition or boundary between two things, or where it is difficult to make a distinction between them. Conversely, the antonyms for "more delineating" would be words like "sharp," "clear-cut," "precise," "distinct," and "definite." These terms describe situations where there is a clear and sharp distinction between two things, and where there is no ambiguity or confusion.