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Girl Interrupted
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impregnable -- as in: the fort was impregnable
Used In
Girl Interrupted
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  • To open a window, a staff person had to unlock the security screen, which was a thick impregnable mesh on a steel frame, then lift the heavy unbreakable-glass-paned window, then shut and relock the security screen.

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  • an impregnable fortress
  • an impregnable argument

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