Impregnable and Undefended

Opposite meaning words

Impregnable adjective - Incapable of being defeated, overcome, or subdued.

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Undefended is an antonym for impregnable.

Undefended adjective - Lacking protection from danger or resistance against attack.

Usage example: the cowardly soldiers fled, leaving the palace undefended

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Impregnable is an antonym for undefended.

Cite this Source

Undefended and Impregnable. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/impregnable/undefended

Impregnable & Undefended. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/impregnable/undefended>.

Undefended or Impregnable. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/impregnable/undefended.

Google Ngram Viewer shows how "impregnable" and "undefended" have occurred on timeline