Perspicuous

perspicuous \pər-ˈspi-kyə-wəs\ adjective: 1. not subject to misinterpretation or more than one interpretation; clear, lucid, easy to understand, 2. (rare) transparent, transluscent

Etymology: Latin perspicuus, from perspicere to see through

Compare perspicuous to diaphanous, pellucid and transpicuous.