"an impregnable fortress"
"fortifications that made the frontier inviolable"
"a secure telephone connection"
"an impregnable argument"
The Schloss Adler is inaccessible and impregnable. It would require a battalion of paratroops to take it.
出自： A. MacLean
She carries within an impregnable conviction of being lovable.
出自： A. Storr
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