The antonyms for the phrase "more crystal clear" are: vague, unclear, ambiguous, murky, opaque, and cloudy. These words refer to things that are not easy to understand and lack clarity. Their opposite, "more crystal clear," suggests that something is easy to understand, transparent, and precise. The antonyms of "more crystal clear" are useful when describing situations where information is limited or difficult to comprehend, such as when trying to understand complex theories or difficult conversations. By using antonyms for "more crystal clear," we can effectively communicate what is not known or understood, providing a more complete picture of the situation.