Antonyms of adj crystal_clear

2 senses of crystal clear

Sense 1
crystalline, crystal clear, limpid, lucid, pellucid, transparent -- (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")

INDIRECT (VIA clear) -> opaque -- (not transmitting or reflecting light or radiant energy; impenetrable to sight; "opaque windows of the jail"; "opaque to X-rays")

Sense 2
limpid, lucid, luculent, pellucid, crystal clear, perspicuous -- ((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")

INDIRECT (VIA clear) -> unclear -- (not clear to the mind; "the law itself was unclear on that point"; "the reason for their actions is unclear to this day")

Similarity of adj crystal_clear

2 senses of crystal clear

Sense 1
crystalline, crystal clear, limpid, lucid, pellucid, transparent -- (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")
       => clear (vs. opaque) -- (allowing light to pass through; "clear water"; "clear plastic bags"; "clear glass"; "the air is clear and clean")

Sense 2
limpid, lucid, luculent, pellucid, crystal clear, perspicuous -- ((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")
       => clear (vs. unclear) -- (readily apparent to the mind; "a clear and present danger"; "a clear explanation"; "a clear case of murder"; "a clear indication that she was angry"; "gave us a clear idea of human nature")