Inexpugnable
Inexpugnable adjective - Having been established and usually not subject to change.
Usage example: an inexpugnable belief in the essential goodness of people
Solid and inexpugnable are semantically related. In some cases you can use "Solid" instead an adjective "Inexpugnable".
Solid
Solid adjective - Based on sound reasoning or information.
Inexpugnable and solid are semantically related. Sometimes you can use "Inexpugnable" instead an adjective "Solid".
Mutual synonyms
Cite this Source
Solid and Inexpugnable. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/inexpugnable/solid
Inexpugnable & Solid. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/inexpugnable/solid>.
Solid or Inexpugnable. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/inexpugnable/solid.
Google Ngram Viewer shows how "inexpugnable" and "solid" have occurred on timeline