an impregnable fortress
an impregnable defense
an impregnable stronghold
They will establish impregnable fortresses.
an impregnable wall of solid sandstone.
the seat I was offered appeared to be an impregnable Tory stronghold.
Liverpool should have used their good fortune to forge an impregnable half-time lead.
O, how shall summers honey breath hold outAgainst the wreckful siege of battering days,When rocks impregnable are not so stout,Nor gates of steel so strong, but Time decays?
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