Impregnable and Unprotected

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

Unprotected is an antonym for impregnable.

Unprotected

Unprotected adjective - Lacking protection from danger or resistance against attack.
Usage example: I was uncomfortable about leaving my house unprotected, so I bought a dog

Impregnable is an antonym for unprotected.
Cite this Source
Unprotected and Impregnable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/impregnable/unprotected
Impregnable & Unprotected. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/impregnable/unprotected>.
Unprotected or Impregnable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/impregnable/unprotected.
Google Ngram Viewer shows how "impregnable" and "unprotected" have occurred on timeline