The term 'clear and understandable' can be summarized by the word 'LUCID'. LUCID is an adjective that means easily understood, clear, and intelligible. It is often used to describe writing or speech that is straightforward and easy to comprehend. LUCID is derived from the Latin word lucidus, which means 'LIGHT' or 'BRIGHT'. This term is often used in literature and other forms of communication to emphasize the clarity of a message.