Bulletproof and Impregnable

Bulletproof

Bulletproof adjective - Incapable of being defeated, overcome, or subdued.
Usage example: this year the city's football team seems bulletproof

Impregnable and bulletproof are semantically related. in indestructible topic. In some cases you can use "Impregnable" instead an adjective "Bulletproof", when it comes to topics like invincible.

Impregnable

Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Usage example: an impregnable fortress that had foiled one invader after another over the centuries

Bulletproof and impregnable are semantically related. You can use "Bulletproof" instead an adjective "Impregnable".

Cite this Source
Impregnable and Bulletproof. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/bulletproof/impregnable
Bulletproof & Impregnable. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/bulletproof/impregnable>.
Impregnable or Bulletproof. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/bulletproof/impregnable.
Google Ngram Viewer shows how "bulletproof" and "impregnable" have occurred on timeline