Impervious
Impervious adjective - Not allowing penetration (as by gas, liquid, or light).
Viscous and impervious are semantically related. In some cases you can use "Viscous" instead an adjective "Impervious".
Nearby Word: imperviously
Viscous
Viscous adjective - Being of a consistency that resists flow.
Impervious and viscous are semantically related. Sometimes you can use "Impervious" instead an adjective "Viscous".
Cite this Source
Viscous and Impervious. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/impervious/viscous
Impervious & Viscous. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/impervious/viscous>.
Viscous or Impervious. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/impervious/viscous.
Google Ngram Viewer shows how "impervious" and "viscous" have occurred on timeline