The clue "Impenetrable to light" last appeared in the The Telegraph Quick crossword on June 19, 2020. The correct answer for this puzzle is "OPAQUE", a 6-letter word.
Solution OPAQUE is 6 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is OPAQUE with 6 letters, and the shortest is OPAQUE with 6 letters.
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The solution is 6 letters long.