"Be understandable" is a phrase that refers to the act of making something clear and easy to comprehend. There are several different synonyms that can be used in place of this phrase, including "be comprehensible," "be intelligible," "be lucid," and "be transparent." Each of these synonyms conveys a slightly different aspect of the idea of clarity and ease of understanding. For example, "be comprehensible" emphasizes the idea of being graspable, while "be intelligible" emphasizes the idea of being able to be understood. "Be lucid" emphasizes the idea of clarity and simplicity, while "be transparent" emphasizes the idea of being open and clear without any hidden or obscured meaning.