Durable
Firm
Firm adjective - Marked by the ability to withstand stress without structural damage or distortion.
Usage example: built on a firm foundation, so the house hasn't settled
Durable is a synonym for firm in stable topic. You can use "Durable" instead an adjective "Firm", if it concerns topics such as constant.
Mutual synonyms
Cite this Source
Firm and Durable. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/durable/firm
Durable & Firm. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/durable/firm>.
Firm or Durable. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/durable/firm.
Google Ngram Viewer shows how "durable" and "firm" have occurred on timeline