Arbitrary
Arbitrary adjective - Having or showing a tendency to force one's will on others without any regard to fairness or necessity.
Obligatory and arbitrary are semantically related. In some cases you can use "Obligatory" instead an adjective "Arbitrary".
Obligatory
Obligatory adjective - Forcing one's compliance or participation by or as if by law.
Arbitrary and obligatory are semantically related. Sometimes you can use "Arbitrary" instead an adjective "Obligatory".
Mutual synonyms
Both words in one sentence
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Arbitrary Skepticism: As of Season 2, any episode dealing with something out of the ordinary will have Chase as the obligatory skeptic.
Source: Western Animation / PAW Patrol
Cite this Source
Obligatory and Arbitrary. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/arbitrary/obligatory
Arbitrary & Obligatory. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/arbitrary/obligatory>.
Obligatory or Arbitrary. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/arbitrary/obligatory.
Google Ngram Viewer shows how "arbitrary" and "obligatory" have occurred on timeline