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What are the antonyms for PENETRABLE?

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Synonyms for PENETRABLE

Usage Examples for PENETRABLE

  1. Root- shaped cavities were observed by Professor Henslow to descend from the bottom of the dirt- bed into the subjacent fresh- water stone, which, though now solid, must have been in a soft and penetrable state when the trees grew. - "The Student's Elements of Geology" by Sir Charles Lyell
  2. Awaiting the rebel leader, to carry him to the fort, was a war elephant, a huge brute, well protected by iron plates, thick knobs of brass, and chain armor, penetrable by no missile short of a cannon- ball. - "The Great Mogul" by Louis Tracy
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