impregnable

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

That had seemed like an impregnable advantage for S&P Global.

From The Wall Street Journal • Feb. 4, 2026

Alcatraz island - nicknamed "the Rock" because it was regarded as an impregnable fortress - is home to the shuttered federal penitentiary that housed some of the most dangerous criminals in the US.

From BBC • Jan. 30, 2026

In theory that threatens Apple’s impregnable walled garden.

From The Wall Street Journal • Jan. 2, 2026

High-flying Crystal Palace are the only side to rival City's attacking threat, while Newcastle are living up to their name by being almost as impregnable at the back as Arsenal.

From BBC • Oct. 15, 2025

But there was another castle nearby, vastly larger and impregnable.

From "A Dance with Dragons" by George R. R. Martin