crystal clear

Adjective
  1. Transmitting light;
    Able to be seen through with clarity (synset 300433489)
    "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"
  2. (of language) transparently clear;
    Easily understandable (synset 300430851)
    "writes in a limpid style"; "lucid directions"; "a luculent oration"; "pellucid prose"; "a crystal clear explanation"; "a perspicuous argument"

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