crystal clear

comparative more crystal clear · comparative rare crystal clearer · superlative most crystal clear · rare superlative crystal clearest · alternative crystal-clear

1. Completely clear (in various senses).
   1. idiomaticsimileWithout ambiguity or doubt; completely understood.

      Reread through the manual until the instructions are crystal clear in your head.

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      Is it not crystal clear, then, comrades, that all the evils of this life of ours spring from the tyranny of human beings?

      1943 November – 1944 February (date written; published 1945 August 17), George Orwell [pseudonym; Eric Arthur Blair], Animal Farm […], London: Secker & Warburg, published May 1962, →OCLC

      At a very basic level, technology almost always supplants some level of humanity. Not only does machine power replace manpower, but it distances, if not isolates, us from each other and from reality in the process. / See for yourself. Pick a technology. Any technology. / The crystal clearest example is probably the advance from cannon balls to atom bombs.

      1997 October 29, Michael Ashcraft, “High tech: Devil made us do it!”, in The Rock Island Argus, 148th year, number 12, Rock Island, Ill., page B1, column 1

      For more than 30 years, the science has been crystal clear. How dare you continue to look away and come here saying that you're doing enough, when the politics and solutions needed are still nowhere in sight.

      2019 September 23, Greta Thunberg, speech at the United Nations

      Synonyms: clear as crystal

   2. idiomaticsimileVisually clear, a sharp image, of high acuity.

      The picture on this TV is crystal clear – you can see every grain of sand!

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      The key is that only the original negative can produce the crystal clearest photographic image.

      2007, David Rudd Cycleback, Judging the Authenticity of Photographs: The Basics for Collectors, Cycleback.com, →ISBN, page 111

      Synonyms: clear as crystal

   3. idiomaticsimileVery translucent or transparent.

      Jimmy and Ravi put together fine silver cutlery, crystal clear glasses and oriental decorated crockery.

      2017, Steven Baker, chapter 16, in Colour Sergeant Chesney V.C., Kibworth, Leics.: The Book Guild Ltd, →ISBN, page 132

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      On the lowest level are broad meadow lands, through which wanders a stream of the most crystal clear water imaginable.

      1893, Charles F[orbes] Warner, editor, Picturesque Berkshire, part I (North), Northampton, Mass.: Picturesque Publishing Company; Springfield, Mass.: The W. F. Adams Company, page 84

      Near by, where the crystal clear River Llugwy is crossed by a bridge, stands a small and ancient church built of massive, irregular boulders.

      1980, AA Book of British Villages, Drive Publications Ltd, page 100

      It is these beliefs that set Clearview Stoves apart and set their company on a quest to design and build a stove that would set new standards and quite simply be the best. Their quest led to a stove with traditional styling, that is simple to use and highly efficient with a wonderful view of the flames behind crystal clear glass.

      2017 October 4, “Guy Crabb Plumbing & Heating”, in View from Weymouth, Weymouth, page 25

      Synonyms: clear as crystal

   4. idiomaticsimileHaving no clouds.

      On crystal clear days, such as those during or just following a Santa Ana windstorm, the Salton Sea can be spotted from this area.

      1965, Russ Leadabrand, A Guidebook to the Sunset Ranges of Southern California: […], Los Angeles, Calif.: The Ward Ritchie Press, →LCCN, page 127

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      Whence it comes that even in the crystal clearest weather Madeira’s sunshine spectrum is inordinately full of water-vapour stopped lines, the sun’s direct rays, though to general observation luminous enough, are signally deprived of their proper scorching heat, and the temperature range of the climate is immensely reduced for both the day and the year; […]

      1882 May 1, C[harles] Piazzi Smyth, Madeira Meteorologic: Being a Paper on the Above Subject Read Before the Royal Society, Edinburgh, on 1st of May 1882, Edinburgh: David Douglas, pages 31–32

      Jones Beach Pond on Long Island, so close to New York that the tops of the Empire State and the Chrysler Building can be seen on the horizon on crystal clear days, is one of the best shore-bird resorts I know.

      1948, Roger Coty Peterson, Birds Over America, New York, N.Y.: Dodd, Mead & Company, page 309

      Synonyms: clear as crystal

   5. idiomaticsimileAurally clear.

      With the slightly nasal, melodic whine of Wooten’s crystal clear vocals this song has a catchy sound to it that guarantees that it has potential to be an ear-bug.

      2004 March 8, Cameron J. Woods, “‘Bloody lovely’ music: New band worth a little money”, in The Daily Collegian, volume CXIV, number 1, Amherst, Mass.: University of Massachusetts Amherst, page 4, column 2

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      There is still space available for the STARFIRE BAND performance featuring the crystal clearest, cleanest Pittsburgh Born and Bred Alto Vocals of the sensational Miss Judi Figel in our Summer Street Dance and Al Fresco Dining (inside if rain) series Music & Dancing 7-11 P.M

      1999 July 30, “D’Imperio’s”, in Weekend Mag (Pittsburgh Post-Gazette), Pittsburgh, Pa., page 33

      A truly powerful and versatile unit, crystal clear music is played through a pair of stereo speakers and has RCA line outputs for amplifier or Hi-Fi system integration.

      2012, 2012 Engineering & Scientific Catalogue, Jaycar, page 218

      Synonyms: clear as crystal