Firm
Firm adjective - Not showing weakness or uncertainty.
Unflexible and firm are semantically related In some cases you can use "Unflexible" instead an adjective "Firm".
Unflexible
Firm and unflexible are semantically related in rigid topic. Sometimes you can use "Firm" instead an adjective "Unflexible", if it concerns topics such as hard.
Mutual synonyms
Cite this Source
Unflexible and Firm. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/firm/unflexible
Firm & Unflexible. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/firm/unflexible>.
Unflexible or Firm. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/firm/unflexible.
Google Ngram Viewer shows how "firm" and "unflexible" have occurred on timeline