Invulnerable and Impregnable

Invulnerable

Invulnerable adjective - Incapable of being defeated, overcome, or subdued.
Usage example: typically teenagers suppose themselves to be invulnerable, so they take needless risks

Impregnable is a synonym for invulnerable in indestructible topic. In some cases you can use "Impregnable" instead an adjective "Invulnerable", when it comes to topics like invincible. popular alternative

Nearby Word: invulnerability

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

Invulnerable is a synonym for impregnable in unyielding topic. You can use "Invulnerable" instead an adjective "Impregnable", if it concerns topics such as unassailable. popular alternative

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