Pellucid

1. Allowing the passage of light; translucent or transparent. Synonyms: clear, limpid, lucid, (rare) perspicuous; see also Thesaurus:transparent Antonyms: opaque
2. (figuratively)
   1. Easily understood; clear. Synonyms: crystal clear, lucid, perspicuous, translucent; comprehensible Antonyms: incomprehensible
   2. Of music or some other sound: not discordant or harsh; clear and pure-sounding.
   3. Of a person, their mind, etc.: able to think and understand clearly; not confused; clear, sharp.
   4. (archaic) Easily recognized or seen through; apparent, obvious.