The antonyms for the phrase "more marked out" can be "less obvious" or "not as evident". When something is marked out, it means that it is clearly distinguished or defined. Therefore, the opposite of this would be something that is vague or uncertain. For example, if a path is marked out, it is easy to follow, but if it is not marked out, it becomes difficult to find the way. Similarly, if a difference between two things is marked out, it is noticeable, but if it is not marked out, it can be hard to determine what sets them apart. In summary, the antonyms for "more marked out" are "less obvious" and "not as evident".