impregnability

• She sat with her back against the foamcast wall…that same wall that held, inside its stupid impregnability, the cables that could release her if she could get at them and destroy them. —  Asimov's Science Fiction [2001.04]
• For a moment its impregnability was too much for the man, and his hands flickered over the gnarled surface with awful helplessness. —  The Tiger In The Smoke - Allingham, Margery - Albert Campion 15
• More precisely, it ended Van der Sar's stretch of impregnability in the league at 1,311 minutes. —  Sport news, comment and results | guardian.co.uk
• There was something about the impregnability of the building that was summoning me, issuing a challenge, singing a siren song -- come in! come in! —  Paula's House of Toast
• But Chelsea's season has so far been anything but routine and having lost their air of impregnability at home, the game suddenly carries far more significance than it would have done just a few weeks ago. —  The Times Of India Sports

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