Perspicuous is an adjective describing language that is clear and easy to understand. When you give a presentation, you should speak in a perspicuous manner so that everyone will be able to follow you.
Someone who is perspicuous speaks in a way that makes the meaning absolutely clear. The word perspicuous dates from the 15th century and comes from the Latin word perspicuus, meaning “transparent, clear,” which comes from the verb perspicere, meaning “to look at closely." Language that is perspicuous is language that is easily understood — to the point where you can almost see it.