Tough to penetrate

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This crossword clue is for the definition: Tough to penetrate.
it’s A 18 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term “Tough to penetrate crossword” or “Tough to penetrate crossword clue”. The possible answerss for Tough to penetrate are listed below.

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Possible Answers: DENSE.

Last seen on: The New Yorker Tuesday, 16 May 2023 Crossword Answers