Credible
Credible adjective - Worthy of being accepted as true or reasonable.
Impregnable and credible are semantically related. In some cases you can use "Impregnable" instead an adjective "Credible".
Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Credible and impregnable are semantically related. Sometimes you can use "Credible" instead an adjective "Impregnable".
Cite this Source
Impregnable and Credible. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/credible/impregnable
Credible & Impregnable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/credible/impregnable>.
Impregnable or Credible. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/credible/impregnable.
Google Ngram Viewer shows how "credible" and "impregnable" have occurred on timeline