Irrational
Irrational adjective - Not using or following good reasoning.
Unserious and irrational are semantically related. In some cases you can use "Unserious" instead an adjective "Irrational".
Nearby Words: irrationality, irrationally
Unserious
Irrational and unserious are semantically related. Sometimes you can use "Irrational" instead an adjective "Unserious".
Cite this Source
Unserious and Irrational. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/irrational/unserious
Irrational & Unserious. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/irrational/unserious>.
Unserious or Irrational. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/irrational/unserious.
Google Ngram Viewer shows how "irrational" and "unserious" have occurred on timeline