Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Ruthless and impregnable are semantically related. In some cases you can use "Ruthless" instead an adjective "Impregnable".
Ruthless
Ruthless adjective - Having or showing a lack of sympathy or tender feelings.
Impregnable and ruthless are semantically related. Sometimes you can use "Impregnable" instead an adjective "Ruthless".
Nearby Words: ruthlessly, ruth
Mutual synonyms
Cite this Source
Ruthless and Impregnable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/impregnable/ruthless
Impregnable & Ruthless. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/impregnable/ruthless>.
Ruthless or Impregnable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/impregnable/ruthless.
Google Ngram Viewer shows how "impregnable" and "ruthless" have occurred on timeline