The phrase "clear as mud" is often used to describe situations or information that are difficult to understand or comprehend. The antonyms for this phrase could be "crystal clear," "transparent," "lucid," "evident," "obvious," or "self-explanatory." These words could be used to describe situations or information that are clear and easy to understand. For example, if someone explains a concept in a simple and clear manner, we could describe that explanation as "crystal clear" or "transparent." Therefore, it is important to use precise and clear language to convey a message effectively and avoid ambiguity, which can be misconstrued as "clear as mud.