Crystal-Clear

perfectly or transparently clear

adjective. : perfectly or transparently clear. crystal clear water. her directions were crystal clear.

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1. completely transparent and unclouded.
2. "careful restoration work had turned the once polluted waters of the river crystal clear"

   • unambiguous; easily understood.

     "the house rules are crystal clear"
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   Crystal-clear can be used with or without a hyphen. It's often used with a hyphen when it comes before the thing it describes, as in crystal-clear glass, and without a hyphen when it follows the thing it describes, as in the glass was crystal clear.