Impregnable
Impregnable adjective - Incapable of being defeated, overcome, or subdued.
Sure and impregnable are semantically related. In some cases you can use "Sure" instead an adjective "Impregnable".
Sure
Sure adjective - Having or showing a mind free from doubt.
Impregnable and sure are semantically related. Sometimes you can use "Impregnable" instead an adjective "Sure".
Nearby Word: surely
Mutual synonyms
Cite this Source
Sure and Impregnable. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/impregnable/sure
Impregnable & Sure. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/impregnable/sure>.
Sure or Impregnable. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/impregnable/sure.
Google Ngram Viewer shows how "impregnable" and "sure" have occurred on timeline