perspicuous

adjective3

1. •
   Clearly expressed, easy to understand; lucid.

   • I am always willing to run some hazard of being tedious in order to be sure that I am perspicuous […] — 1776
2. •
   (Of a language or notation) the process of inference from premises to conclusion is explicitly laid out.
3. •
   (rare) That can be seen through clearly; that lets light through.