Impervious
Impervious adjective - Impossible to get through or into.
Usage example: the rain forest is impervious to all but the most dedicated explorers
Substantial and impervious are semantically related In some cases you can use "Substantial" instead an adjective "Impervious".
Nearby Word: imperviously
Substantial
Substantial adjective - Having great meaning or lasting effect.
Impervious and substantial are semantically related in sturdy topic. Sometimes you can use "Impervious" instead an adjective "Substantial".
Both words in one sentence
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Weaksauce Weakness: Troops garrisoned in buildings are impervious to attack, and can bring substantial firepower to bear against enemies, racking up experience while safe from retaliation and getting run over.
Cite this Source
Substantial and Impervious. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/impervious/substantial
Impervious & Substantial. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/impervious/substantial>.
Substantial or Impervious. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/impervious/substantial.
Google Ngram Viewer shows how "impervious" and "substantial" have occurred on timeline