Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Staunch and impregnable are semantically related. In some cases you can use "Staunch" instead an adjective "Impregnable".
Staunch
Staunch adjective - Firm in one's allegiance to someone or something.
Impregnable and staunch are semantically related. Sometimes you can use "Impregnable" instead an adjective "Staunch".
Mutual synonyms
Cite this Source
Staunch and Impregnable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/impregnable/staunch
Impregnable & Staunch. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/impregnable/staunch>.
Staunch or Impregnable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/impregnable/staunch.
Google Ngram Viewer shows how "impregnable" and "staunch" have occurred on timeline