Impregnable
Impregnable adjective - Impossible to get through or into.
Usage example: the castle's supposedly impregnable walls
Stiff and impregnable are semantically related. In some cases you can use "Stiff" instead an adjective "Impregnable".
Stiff
Stiff adjective - Incapable of or highly resistant to bending.
Impregnable and stiff are semantically related. Sometimes you can use "Impregnable" instead an adjective "Stiff".
Mutual synonyms
Related pairs
- firm and impregnable
- firm and stiff
- resolute and impregnable
- resolute and stiff
- fixed and impregnable
- fixed and stiff
- steadfast and impregnable
- steadfast and stiff
- inflexible and impregnable
- inflexible and stiff
- unyielding and impregnable
- unyielding and stiff
- immovable and impregnable
- immovable and stiff
Cite this Source
Stiff and Impregnable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impregnable/stiff
Impregnable & Stiff. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impregnable/stiff>.
Stiff or Impregnable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impregnable/stiff.
Google Ngram Viewer shows how "impregnable" and "stiff" have occurred on timeline