Rigid
Rigid adjective - Not allowing for any exceptions or loosening of standards.
Unflexible and rigid are semantically related In some cases you can use "Unflexible" instead an adjective "Rigid".
Unflexible
Rigid and unflexible are semantically related in hard topic. You can use "Rigid" instead an adjective "Unflexible".
Mutual synonyms
Both words in one sentence
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The Royal Guard was called in to safeguard the Pony settlers, but was quickly overwhelmed with the Diamond Dogs presence, who at that point had already resorted to irregular warfare (against the painfully rigid, outdated and unflexible tactics of the Guard) to great effect.
Source: Just For Fun / Ponies with Pikes
Cite this Source
Unflexible and Rigid. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/rigid/unflexible
Rigid & Unflexible. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/rigid/unflexible>.
Unflexible or Rigid. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/rigid/unflexible.
Google Ngram Viewer shows how "rigid" and "unflexible" have occurred on timeline