Nonporous
Nonporous adjective - Not porous; especially not having vessels that appear as pores.
Tough and nonporous are semantically related. in firm topic. In some cases you can use "Tough" instead an adjective "Nonporous", when it comes to topics like inflexible.
Cite this Source
Tough and Nonporous. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/nonporous/tough
Nonporous & Tough. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/nonporous/tough>.
Tough or Nonporous. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/nonporous/tough.
Google Ngram Viewer shows how "nonporous" and "tough" have occurred on timeline