There are many synonyms for the phrase "easy to understand," including straightforward, simple, clear, plain, intelligible, uncomplicated, and lucid. These words all convey the idea that something is easy for the reader or listener to comprehend. Additionally, the terms user-friendly, accessible, and intuitive can be used to describe something that is easy to use or navigate. When communicating with others, it's important to choose the right words to convey your message clearly and effectively. Therefore, choosing the appropriate synonym for "easy to understand" can significantly improve how others interpret your message.