Words similar to impregnable

Example sentences for: impregnable

How can you use “impregnable” in a sentence? Here are some example sentences to help you improve your vocabulary:

The dramatically rising cliff of black basalt stone made the castle impregnable to all but the most wily commander.
King Prithvi Narayan Shah had difficulty conquering Kirtipur, whose site atop a ridge with two high points made it virtually impregnable.
impregnable Non-English speakers have been known to think this means inconceivable.
Advanced cryptography could be used to make phone conversations impregnable to wiretap and financial records invulnerable to subpoena.
Once a vast fortification of 49 turrets, it ranked alongside Osaka and Nagoya as one of the country’s greatest impregnable bastions.