Firm
Firm adjective - Not showing weakness or uncertainty.
Unreversible and firm are semantically related. In some cases you can use "Unreversible" instead an adjective "Firm".
Unreversible
Firm and unreversible are semantically related. Sometimes you can use "Firm" instead an adjective "Unreversible".
Mutual synonyms
Cite this Source
Unreversible and Firm. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/firm/unreversible
Firm & Unreversible. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/firm/unreversible>.
Unreversible or Firm. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/firm/unreversible.
Google Ngram Viewer shows how "firm" and "unreversible" have occurred on timeline