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 Moors were on the retreat, withdrawing to the almost impregnable mountain fortress area of Granada, where they held out until 1492.
impregnable Non-English speakers have been known to think this means inconceivable.
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.
King Prithvi Narayan Shah had difficulty conquering Kirtipur, whose site atop a ridge with two high points made it virtually impregnable.
Surrounded by a pair of precipitous ravines, the imposing walls of the citadel were some forty feet high and twenty feet thick, virtually impregnable.