Impermeable
Impermeable adjective - Impossible to get through or into.
Usage example: the wall of security people surrounding the rock band was impermeable
Substantial and impermeable are semantically related. In some cases you can use "Substantial" instead an adjective "Impermeable".
Nearby Word: impermeability
Substantial
Substantial adjective - Having great meaning or lasting effect.
Impermeable and substantial are semantically related. Sometimes you can use "Impermeable" instead an adjective "Substantial".
Cite this Source
Substantial and Impermeable. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/impermeable/substantial
Impermeable & Substantial. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/impermeable/substantial>.
Substantial or Impermeable. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/impermeable/substantial.
Google Ngram Viewer shows how "impermeable" and "substantial" have occurred on timeline