Firm
Firm adjective - Having a consistency that does not easily yield to pressure.
Usage example: cold butter that was too firm to spread
Nonporous and firm are semantically related. in inflexible topic. In some cases you can use "Nonporous" instead an adjective "Firm".
Nonporous
Nonporous adjective - Not porous; especially not having vessels that appear as pores.
Mutual synonyms
Cite this Source
Nonporous and Firm. (2016). Retrieved 2026, August 01, from https://thesaurus.plus/related/firm/nonporous
Firm & Nonporous. N.p., 2016. Web. 01 Aug. 2026. <https://thesaurus.plus/related/firm/nonporous>.
Nonporous or Firm. 2016. Accessed August 01, 2026. https://thesaurus.plus/related/firm/nonporous.
Google Ngram Viewer shows how "firm" and "nonporous" have occurred on timeline