General Synonyms:
* Understandable
* Comprehensible
* Clear
* Plain
* Lucid
* Cogent
* Articulate
* Explanatory
* Meaningful
* Significant
More Formal Synonyms:
* Perspicuous
* Concise
* Precise
* Definitive
* Elucidated
Synonyms Emphasizing Clarity:
* Transparent
* Obvious
* Straightforward
* Unmistakable
Synonyms Emphasizing Meaning:
* Significant
* Meaningful
* Relevant
* Pertinent
The best synonym to use will depend on the specific context of your writing. For example, if you are talking about a clear explanation, "lucid" might be a good choice. If you are talking about a concise and precise argument, "concise" might be better.