The phrase "clear as dishwater" refers to something that is easy to understand, straightforward and unambiguous. However, if we were to look for antonyms of this phrase, we would find words such as confusing, complicated, unclear, obscure, and equivocal. These words indicate a scenario where the situation, message, or the point being communicated is not well-defined, and therefore, is difficult to comprehend. People or things that are mysterious, unintelligible, or perplexing can be classified under these antonyms. The antonyms of the phrase "clear as dishwater" are especially useful when trying to describe experiences, messages, or works of art that are intricate, subtle, and difficult to understand at first glance.