transmitting light; able to be seen through with clarity
"the cold crystalline water of melted snow"
"crystal clear skies"
"could see the sand on the bottom of the limpid pool"
"lucid air"
"a pellucid brook"
"transparent crystal"
(of language) transparently clear; easily understandable
"writes in a limpid style"
"lucid directions"
"a luculent oration"
"pellucid prose"
"a crystal clear explanation"
"a perspicuous argument"
Completely clear and understood.