Permanent
Permanent adjective - Lasting forever.
Rigid and permanent are semantically related in established topic. In some cases you can use "Rigid" instead an adjective "Permanent".
Rigid
Rigid adjective - Not allowing for any exceptions or loosening of standards.
Permanent and rigid are semantically related in established topic. Sometimes you can use "Permanent" instead an adjective "Rigid".
Mutual synonyms
Cite this Source
Rigid and Permanent. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/permanent/rigid
Permanent & Rigid. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/permanent/rigid>.
Rigid or Permanent. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/permanent/rigid.
Google Ngram Viewer shows how "permanent" and "rigid" have occurred on timeline