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:

NYT columnist Thomas Friedman says that the U.S. airstrikes against Iraq last month rattled Saddam and showed that his system of control and intimidation is less impregnable than previously feared and weakened his support among his military protectors, the Republican Guards.
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.
The Moors were on the retreat, withdrawing to the almost impregnable mountain fortress area of Granada, where they held out until 1492.
Once a vast fortification of 49 turrets, it ranked alongside Osaka and Nagoya as one of the country’s greatest impregnable bastions.