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impervious

Impervious means not being able to be penetrated or not able to be hurt. (adjective)

  1. An example of impervious is a fabric that does not allow any liquid to pass through.
  2. An example of impervious is a figurine made out of indestructible material.

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See impervious in Webster's New World College Dictionary

See impervious in American Heritage Dictionary 4

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