When it comes to describing something that is crystal clear, there are plenty of synonyms that you can use to make your language more engaging and descriptive. For example, you could refer to something as being lucid, transparent, or pristine. Other words that can be used to convey the idea of clarity include unambiguous, unequivocal, and unmistakable. If you're talking about water, you could describe it as being pure or sparkling, while describing a person's vision or perception as sharp or focused could convey the idea of crystal clarity. Ultimately, the right synonym for "crystal clear" will depend on the context and the specific nuances you wish to convey.