crystal clear

/ˌkrɪstl ˌklɪər/

/ˈkrɪstəl klɪə/

Definitions of crystal clear

1. adjective

   transmitting light; able to be seen through with clarity
   “crystal clear skies”

   synonyms: crystalline, limpid, lucid, pellucid, transparent

   clear

   allowing light to pass through
2. adjective

   (of language) transparently clear; easily understandable
   “a crystal clear explanation”

   synonyms: limpid, lucid, luculent, pellucid, perspicuous

   clear

   readily apparent to the mind