'crystal clear' definitions:

Definition of 'crystal clear'

From: WordNet
adjective
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" [syn: crystalline, crystal clear, limpid, lucid, pellucid, transparent]
adjective
(of language) transparently clear; easily understandable; "writes in a limpid style"; "lucid directions"; "a luculent oration"- Robert Burton; "pellucid prose"; "a crystal clear explanation"; "a perspicuous argument" [syn: limpid, lucid, luculent, pellucid, crystal clear, perspicuous]