Dense
Dense adjective - Having little space between items or parts.
Impregnable and dense are semantically related. In some cases you can use "Impregnable" instead an adjective "Dense".
Impregnable
Impregnable adjective - Impossible to get through or into.
Usage example: the castle's supposedly impregnable walls
Dense and impregnable are semantically related. Sometimes you can use "Dense" instead an adjective "Impregnable".
Mutual synonyms
Cite this Source
Impregnable and Dense. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/dense/impregnable
Dense & Impregnable. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/dense/impregnable>.
Impregnable or Dense. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/dense/impregnable.
Google Ngram Viewer shows how "dense" and "impregnable" have occurred on timeline