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unpollutable

From Wiktionary, the free dictionary

English

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Etymology

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From un- +‎ pollutable.

Adjective

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unpollutable (not comparable)

  1. Not pollutable; resistant to pollution.
    • 1908 January 4, John Muir, “The Hetch Hetchy Valley”, in Sierra Club Bulletin‎[1], volume VI, number 4:
      "Hetch Hetchy water is the purest, wholly unpolluted, and forever unpollutable."
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